two things:
the three tips of the mountainrange to the right look extremly fake because they are made of too few faces and are topped off by a single vertex each.
the ship doesn't interact with the enviroment. if an object of that size flies over water it has to do so at a vey high speed or it will drop down like a stone. it will press air and water away, ploughing though the water.
other than that it is really nice, so if you can/want to change it a bit it will be very good
