Good job mimicking RTP style. There's a few things needa change though:
- When you do the hair, you need to pay attention to the head of the characters (just like how you do your sprites

) Here's how the head would look underneath, and because you did not notice this, your character's head is looking a little weird ...
- Also, I'm not sure if you it's intentional, but normally when you do a male, try to give him higher cheeks, it makes him look more mature (your character is like, late teens or young adult at least, right?)
-One last thing is (maybe you already noticed, because this is still a WIP OvO, but I just mention anyway), that is the darkest shadow of characters' neck is often outlined in RTP (I added that for ya). If you use SAI, just color like usual and change the paint effect to fringe, that would take care of it instantly. If you use other programs, then Idk xd