Submarine Art - WWII Tench Class Diesel Boat

[rsallen]

This is a drawing I recently did that pretty closely approximates my Dad's boat - the USS Toro. A 20 year submarine force veteran myself, I followed in my father's footsteps as did my youngest brother and his son - who is currently serving.
A tribute to those crusty WWII Submarine Veterans, we lost 52 boats during the timeframe of that war and over 3000 men. These boats are a far cry from the ones I served on and those are primitive in comparison with the new Virginia Class Submarines. (I haven't taken the time to digitally reproduce the Toro patch yet).

The submarine still gets some tweaks every now and then. Maybe I should add some rusty, and crusty hull areas to make this more photo-realistic. Any suggestions - or leads to tutorials for weathering this drawing will be appreciated.

Thanks for looking and commenting!