Excellent work. Good detailing, good design silhouette, and nice color choices. Has the feel of the Russian Hind helicopter with the two canopy bubbles next to each other, but with a WWII canopy frame styling.
If I had to really try hard to find anything wrong with it, I can only find very small nit picks. The front ball turret is a little off. It doesn't sit exactly on the center line of the square panel it is mounted on. So yeah, the perspective is off a little on that. The perspective of the small bottom fin between the legs (and on the bottom cylinder intake looking thing) is also off. If I line up perspective lines that match the perspective of the foot pads to the horizon, then re-check the perspective of the seams on the bottom fin, they are a bit off.
But really, that's nit picking. But, when you're showing your portfolio around to art directors, they tend to nit pick a lot. So, just thinking of that situation is all.
Great work though, love to see more!