First of all I would like to say I am glad you feel bad and finished a beautiful peace.
Things I liked: The colors, shading, making a bigger bosom flattering and appropriate. The inventiveness and small details the sand clouds floating in front of the space craft.
Things I think you could improve on: her nose could a line with where she is looking along with the goggles on the helmet. The arm angle is physically impossible the elbow needs to be down more and would be restricted further by the big bosom. And although it is a skin tight ensemble there should still be some creases.
I wrote things you could improve on so you can further you art because no one can learn if they do not own. I look forward to future art from you.