I've been browsing through a a lot of MLP fan-art lately, and I've noticed that humanized Rainbow Dash is usually depicted with small breasts. So it seems like most artists have the same view as you on the matter.
who cares if she looks like a boy. first off I did not think she looked like a boy until I read your comments. Also I thought Rainbowdash was supose to look like a boy anyways. IE tomboy. keep up the good work
something tells me this is what rainbow dash looks like in a comic book series. the goggles look really good on her even though there is no real use for them..... unless she has school and has her own goggles for science! (this is all very unlikely. a dude can dream, right?)
First of all, great job on this. Second of all, you mention that she looks like a boy. And, yeah, I can definitely see this being interpreted as male, but I could also see it being a girl too. It's pretty androgynous, which I think fits Rainbow Dash very well. Nicely done!