Alright, sorry for the double post, but I got a bit of work done and came up with what I think is a slight improvement over my original. Compare.
versus
I slimmed down the width of the body (I tried the length, but when I shortened it it just kind of looked wrong, I'm not sure why), rounded out the elbows to the classic look, changed the colors to make it lighter, and (probably most notably) changed the hair dramatically. It looks awful and scraggly but this is just an attempt at getting the hair to match the actual curvature of the head and look a bit more natural.
Still can't figure out how to round out the fingers without attaching little dots to the ends, but I'll get that when I have more time to explore Inkscape.
Anyway, hope that looks a bit like an improvement.
Edit: Also increased the width of the arms and legs, possibly some other stuff that I can't recall.