Tashology

When mapping try to avoid big open spaces. Try to fill areas with detail like tufts of grass and flowers or whatever to make it feel a little more real and lived-in. Other than that, I echo what others have said; check out some mapping tutorials. Best of luck!

Definitely second. I love the cartoony look but the second one is a lot more precise and prettier.

It's a good website, I like the design (did you design it or is it a template?) If you're serious about getting professional work, you might want to put your full name and maybe a photo on there (I have done on my portfolio site, that I show employers when I go to job interviews) but other than that, it's really good.