I’m a newbie here myself, but I think they look great. Nice and clean. Doesn’t look like you’ve used a wash to shade them. It’s a very easy step and would really help with things like the rib cages on the skeletons in the back with exposed ribs.
Congratulations!
Being you first try they look pretty smooth (the paint) and you seem to have quite a nice control of the brush too!
I spot some washes too (not sure), you can go a bit mad with washes and skeletons.. go have fun with them ^^