To be perfectly honest, I think the windows could have been done much better. The whole texture just seems to be one long grey expanse... the bit coming out of the top looks great, the rest looks sub-par.
I hate to say it, but what did you expect from a stealth boat that travels under water?
Rainbows?
I'd be lying if I said I was remotely good at texturing though (The skin is a completemap baked from the high res), however keeping in mind the above point, and the fact it's a skybox model that'll rarely be very close to the player I'm not sure how it's an issue.
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