The symbol on the prow to me is out of place, as a decal go for it, but not as part of the structure. I don't think it suits the Gallia line, and if it was a bit more chunky somewhat in the centre of the vessel it would leave space for crew, reactor the works.
The ship is a nice model overall, just some touch ups would make it better in my eyes. That u-boat like gun is out of place to me, either mount it near the prow or not, a big gun on the rear isn't effective placement.
Like most people I use 3ds Max, though lately I've been trying to play around with Maya and get the swing of that. Self taught for the most part and it shows in my technique, always room to get better though. If you want to get better read, and do, especially the do.
Practicing as much as you can will go miles to getting you to a better place with your work.