Hey, nice MOCs!
I think your designs show a lot of promise, but there are a few things we need to work on
1. The designs are a bit blocky. Try using some slopes, or a little more SNOT to smooth'em out ;-)
2. The door on the truck is a little high, and small. Try making a larger door, and making a little step-ramp thing for people to get up there :-P
3. Interesting...color...scheme on the boat :-D Hey, when it comes to Lego, almost anything can work. Just try to make the coloring a bit more natural, if you know what I mean. Not so blotchy
Overall I think it's a great start, and I can't wait to see modifications and future MOCs!