I do not possess any knowledge as far as maps and appropriate usage of tilesets is concerned so I wouldn't be able to provide proper critique on that front, I'm afraid. In fact, in all honesty, everything that you have on display over here is kind-of new to me. Never been into spriting much haha. I'll just comment with whatever comes to my mind.
First off, those characters you've made look terrific. There's proper variation in hairstyles and clothing in almost every single one of those and I really like that about your stuff. The only aspect of your works that irk me a bit are the ears in some of them.
This and
this for instance (more apparent in the latter, imo). They'd look fine at a glance but when you look at the piece for a while the ears somehow just don't...look natural, I guess? I'm not an expert on anatomy but they just don't. At least to me.
While I don't typically go back to edit my older splices, I'll try to keep this in mind. Because these are splices and not full custom sprites (yet :P), I believe the problem lies on: 1. me cutting off the body usually right under the ear and 2. the ear not always being part of the hair. However, I'll keep in mind to double check ears from now on.
A minor thing -
this one's hair density seems a little lesser than how much would be appropriate. Just a tiny bit. Maybe add more hair at the top - expand the canvas just a tiny bit at the top, maybe? Right now it feels kind-of off.
Out of your maps, I like
this one the most. I'm not really a fan of maps comprising of mostly square tiles and this one has quite a bit of variation in it - what with it having those trees, bridges, the lake, a castle and houses. They look pretty damn nice. Speaking of nice things,
this one's tiles look really great. The detailing is immaculate. Color scheme may be kind of standard considering it is the interior of a castle but that doesn't change the fact that it works very well and looks great.
I like your stuff. Please keep them coming. :D