Nice shot! The plane is very detailed and sharp, even in the compressed version! I also like the detail of the ground textures. But the plane looks so lonely over this huge area of tundra (or somethind like that). Maybe it would make it better if you add some clouds or show a part of the sky, just to give some contrast to this green colour of the ground. I'm not a pro at all but this is just the impression I have.
I like tihs shot, but I think it's too blue-green-ish... Also, why did you upload the other version that is less compressed? I don't see much difference, it certainly has little impact on the quality of the shot. IMHO, it's just a useless waste of server space... :-/