I have been playing around with the first build, and while I had a lot of fun discovering the possibilities I noticed some things:
1) Using the texture builder is fun and once you get the hang of it, pretty versatile. However, I (and probably many others) have no experience in making actual textures or decals (or normal maps for that matter) and trying to get some details right, like the inside of the mouth together with the teeth, the contours of the vagina or eyeliner/shadow is very tedious. I think it would be great to have some presets for teeth, female genitals and maybe makeup, so that you can easily pick their color similar to the eyecolor.
I know that for the bunny example the mouth/teeth texture is given, and I am sure that once the cloud goes online one could extract assets from the works of the very talented people using the creator, but it would still be very much a QoL function for the less technically inclined. The same goes for more hairstyles, but I assume that there will be more models to chose from in future builds (or once the cloud is up).
2) The fluff appendages look very nice when applied thoughtfully (although I miss the furshaders from YL1 a bit), but it would be nice to not have to apply every single fluff instance seperately. What I am thinking of is a "brush" function that you can paint an adjustable density of fluff onto the character.
3) Regarding facial expressions, I can understand that they are not implemented in this first build (apart from one smile setting for the bunny). I have to say though, the reason I like YL1 so much is the sheer number of possible expression you can give your characters (or some characters at least), so I hope this aspect is not forgotten in future builds. I am a bit concerned because of how eyebrows are only implemented as decals, as opposed to YL1, where they were built into the characters and could be directly manipulated through expression settings.
4) This is more of an observation, but the breast physics seem hella wonky when trying to pose a character. I assume that has to do with (unfinished?) collisions, because it only happens in the nature environment. When I lay a character on the ground there, the breasts get squished in random directions.
Other than that, YL2 looks to be the start of a solid product (apart from bugs which are completely understandable for how early it is in the games lifetime), and I look forward to how this develops.