Nice improvement from the ship dude, its neat that your working on a big scale
The curved edges are well coloured, i think the general repetative tiles. I would recommend make the little box thing on the top the normal shape of a submarine so people get the general idea what it is. + Will add more interest.
I think you did get a nice world war d-day feel tbh ^_^ I just woke up ill give you some decent crits later :P But nice work