I like this!
As far as ideas for changes / improvements:
-maybe replace the 1x1 grey tile (above the left canon, midway) with a grey cheese slope, and do the same on the other side, as well (which would mean you'd have to move that 1x2 printed tile forward or back a bit).
-tile the entire top of the cocpit section. This might make it look to tall, though, so if there's a way to sink the cocpit down into the model by a plate's height, that might do the trick.
-those 2x2 grey wheel hubs used on the rear of the model look a bit large, to me. Maybe go down a hub size or two.
-I agree with others that the cocpit does seem a little too short. If you can find a way to extend it both forward and back, I think that'll help. (I seem to remember the front of the cocpit being closer to the very front edge of the snowspeeder.)
That's all I can think of.