Hey man, nice to see you make a sketchbook as well. It's not a problem if you want to post 2d stuff only, the forum title isn't really accurate on that
your 2D skills are really looking alright, nice work. But like you mentioned yourself, the 3D, hmm...
I wonder, why are you working on this kind of large projects. A street with water, houses, a boat, that's some serious business if you want to get that right. For practice, I'd really suggest you work on smaller projects. They're easier, done quicker so you can move on to the next one, etc...
just a thought...