Hey, come on... You are not gonna give up after starting! Besides, it is not that bad, actually it went pretty well for your 1st attempt! For example.... I can't draw any kind of faces properly nor female bodies (that's why you won't find any of them in my gallery: It all started when I found that masks and helmet for me are cooler then regular faces and then I stopped drawing faces) ... Well I am working on it and my "first attempts" were pretty horrible and worse than yours, they were more like commiting attrocities on the paper than a picture XD
Now, for a general appretiation of your draw... I don't know if it was the way you were helding the camera, but the angle of the face is a bit messed up. You might want to draw a general of the skull before moving to the details. Like the Jaw, the bottom should be more flat: it is making a sharp angle comparing to the mouth.