Coloring you minimized several problems that were evident in the line art.
So now may look as a very personal style and not consequence of some technical limitation ....
I feel it on a sort of threshold as if you have to chose :
forget about try realistic proportion and just develop your personal style
or learn some more basic about prospective and anatomy
I mean it is nice but also a bit weird:
the waitress looks a bit as a curios mix between a woman and a children :
very young children and adult have VERY different body proportion , the waitress seems a wild mix of both (but the mix give also a interesting effect and may be developed in a peculiar style

)
Let say that the proportion of head and neck with the rest of the body are close to that of a infant but the rest of the body and face expression are mostly woman like
The bottle and the glass are much undersized ,
...or maybe are correct but if correct that drink is for a little doll of a little doll house,
if not should be much bigger.