High Poly Head and Freyja do different things. High Poly Head provides a higher poly version (meaning a more detailed version with more vertices) of the original Skyrim head mesh. This means that while the new head mesh is smoother and allows for finer tinkering in (e.g. in the RaceMenu mod), it still uses the ugly vanilla head mesh as a base, and therefore it still suffers from the weird proportions and plain ugly shapes of that mesh. (This is no attack on the author of that mod, she/he did great work.)

Freyja takes a different approach. Its female head mesh does not rely on the original one. It was created from scratch by me, and therefore, it has none of the original vanilla ugliness. Furthermore, I provide new race morphs, CharGen morphs and animation morphs, resulting in more beautiful faces for all female characters and more expressive animations.

So, in short:

Use High Poly Head if:

• you like the vanilla face, the vanilla race appearances and the vanilla customisation options (noses, eyes, lips, etc.)
• you like to tinker with lots of vertices in sculpt mode of the RaceMenu mod
• you are very attached to High Poly overhauls of vanilla NPCs
• you want a more detailed version of the vanilla mesh

Use Freyja if:

• you want better looking female characters and NPCs out of the box
• you do not want to be dependent on NPC Overhauls that “fix” the ugly head meshes of NPCs
• you want beautiful, normal-looking elves, orcs, humans and vampires
• you don’t like (most of) the eyes, noses, lips options provided by the vanilla game
• you want a solid basis to build your own female characters/NPCs on
• you want a new, more beautiful face mesh with new eyes, race appearances, customisations and animations
• you want a tool to instantly beautify every NPC in every mod with a few clicks in the  Creation Kit

Short answer: Yes.

Longer answer: Depends on your definition of lore-friendliness. Since the races (mostly) maintain their race characteristics, the customisation options are somewhat similar to the original ones, the animations fit and the characters still look like women, I would say yes.

However, there are a few things to note: With Freyja, the women look more beautiful. Their eyes are bigger and set lower, their faces have more pleasing proportions, and their appearance overall is more delicate and idealised. Also, they look more similar to each other, since I took a more conservative (and more sensible) approach to the sliders and customisation options. (No more NPCs with mouths down on their chins and eyes up in their hairline, no more weird-looking eyes, noses and lips.)

Additionally, there are a few notable changes to the races:

 Skyrim |  Skyrim SE |  Skyrim AE

• Elves look more normal - no weird eyebrows, pointy chins and emaciated faces
• Orcs look more human and pretty - no snouts, no ridiculous underbites, no crooked teeth
• Vampires look more normal - no emaciated faces, but long fangs
• Bretons look more elvish - they now have pointed ear tips

 Enderal |  Enderal SE

• Starlings and Aeterna (elves) look more normal - no weird eyebrows, pointy chins and emaciated faces

See the images for comparisons with the original faces and decide for yourself if Freyja is lore-friendly enough for you.

No. I don’t do commissions, my mod comes as is, and I like how it looks.

Furthermore, since all the races share the same files, it is impossible to overhaul one race but not another. I would have to alter the existing race morph, and it takes time and effort to create a race morph that looks good and works well with all of the CharGen options and animation morphs, not even mentioning all of the adjacent additional meshes that need to be adjusted to fit the new morph.

So no, I won’t provide race morphs (or CharGen and animation morphs for that matter) that look more like their vanilla counterparts (like ugly elves and beastly orcs). This is my mod. If you want the races to look like vanilla, just use vanilla. This mod is for everyone else who wants something different.

Regular NPC overhauls change an NPC’s appearance by adjusting sliders and choosing different eye/nose/lips options for them. Furthermore, sculpting the exported FaceGenData of each individual NPCs seems to be another, more detailed approach.

Freyja is not a NPC overhaul per se, since it doesn’t alter any NPCs directly. It replaces the NIF and TRI files that act as building blocks for the female NPCs’ head mesh (FaceGenData). This leads to their appearance being altered when their FaceGen data is exported with Freyja activated.

The comparison pictures in the images tab do show the same characters with the same customisation options (nose, lips, …), only first with the original NIF and TRI files (left side) used to build the head mesh (FaceGenData), and second with Freyja’s NIF and TRI files (right side) used to build the head mesh. The difference lies in the construction parts, not in the customisations. This is also why Freyja does not come with an ESP file - no NPC record has been altered.

In addition to that, since Freyja changes the underlying building blocks of the female head appearance, the player character as well as any other female character/NPC created by any mod is affected by Freyja and benefits from its visual improvements. It is therefore possible to instantly beautify any female character from any mod with one click in the CK.

TL;DR: Freyja changes the building blocks for female character’s head appearance (FaceGenData), not the female characters themselves. It therefore affects any and all female characters (base game and modded).