First the good: - Great color use, nice use of the different hues of low saturation colors. - Good sense of metal. - Background seems really detailed and "right", even though it isn't on further examination
Unfortunally, the focus is completly off, the commander is the most interresting element of the picture and the composition also points towards him, but he is actually the least detailed object taking away a lot of impact away from the picture and makes it look much worse than it really is. This is something I noticed in your other pieces too, though not to that extent. You use different levels of detail for different parts, which is great, but you seem to decide on the level of detail solely on the lightness of it which is rather suboptimal, you'll need to render the more interresting parts no matter the level of light.