That's a good start! Colored pencils are great (they get really fun when you start overlaying colors to make new colors, and then textures and patterns), and graph paper is just plain awesome ... You do have a slight case of fill-every-corner-of-the-page-with-land syndrome, but I've seen worse - you should pull through all right.

I'm not going to touch the rivers except to say... If you find an interest in correct river placement, there is a tutorial floating around here somewhere, about 'getting your rivers in the right place' and there are probably a few others.

Only other thing that really jumps out is your legend contents... They seem a bit sloppy for having been drawn on graph paper, although, I have to admit, it does give it an endearing quality. I look forward to seeing more of your work.