Shading critique?

[Lexou Duck]

It looks quite good as is, but there are a couple things you could do to liven up the colors
First of all it's pretty low contrast, making the shades further apart from each other might sharpen out the detail (depends on which parts tho, on some the contrast is fine)
Secondly, try hue-shifting your shades : instead of having your gray go into the shades with the same tint of gray, try to get some dark reds insteads (or some other tint might work, but reddish seems like it'd suit this well)

Lastly, that explosion doesn't really fit, it'd be better to try and change the shading of the vehicle around that explosion so they go together better