oh, thats' a door? well there's a problem right there, aircraft doors tend to lie flush with the rest of the craft, so all you'd really need to shade there would be the seam where the door opens and closes.
Try to work from reference, it'll help.
Also, don't do the two-part shading thing with your metal gleams here, that's doing too much for what you should be going for here and it looks very out-of-place. Try to keep it to three shades for cell shading: Light tone, mid-tone, and shadow.
I also reccomend looking at some pictures of plexiglass to better understand how light contours around that kind of material.