Looks pretty good. Suggestion for improvement - build more models as it looks like you have the basics down. The only other thing I could suggest is that, when you do something like the painted false canopy on the nose, use thinly cut masks as freehanding something like that takes a very steady hand to get it to look right.
Overall though, I thing you did OK. If you want to get a few more detailed observations, send me a PM as I don't want to post things that might influence what the other judges think.