I like the drawing without colour better, there I can see the folds and good proportions etc. Here I'm very disctracted by the airbrush. The airbush is not the best tool to colour digital art with. And you probably know it yourself already: The light is coming from all different places it seems and your colours didn't stay inside the lines...
Here is a tip if you want to choose the right colour to shade: Never choose a darker version of that colour! That doesn't look pretty.
Also, pure grey doesn't look pretty either, just a little bit pink or blue or whatever you think is best. Just try. Good luck!
Extra point on the originality for the text.