The headshot image on the side / speech bubble does change based on your assets (just ears and horns).
Here is the new default and with horns / hair color change:
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However, one thing I didn't do in 0.38 is hide the ears once you have illusion magic.
Originally it was because the code was starting to get more convoluted and I was avoiding crossing any wires, but I'm probably going to fix it for the next update.There are just some events where it's a bit of a pain because I have a variable for you "having" illusion magic, not for using it.
side note, the headshot's outfit doesn't change regardless of what you're wearing.
As to the second part of your question, if you're asking about the scenes where the character wakes up and inspects their new features, I'm actually working on those at this very moment. Some sexual scenes will be updated based on whether the character has horns / tail, since photoshopping the horns and tail don't usually take me that long to edit. But I don't think I'll be editing every single scene.
Hair color also will not be reflected in most scenes. Making a single outfit, then photoshopping multiple hair colors / optional horns already takes up most of a day for me.
Version 0.38 is already 450mb larger than version 0.36 too, so size is also an issue (though I'll be adding an optional jpg version of the game to reduce size and lower image resolution).