Any advice for a newbie photographer?

My portfolio is here. (samrickim.darkfolio.com). I use DeviantArt for artist networking, photo storage, print sales (yeah, right!) and the premium portfolio service (although I really, really want to find somewhere better) and I'm getting a bunch of business cards from Moo with my photographs on them (I have a coupon, feel free to message me for it) on June 25th. I've been taking photos at Sawgrass Nature Center and a few local preserves and parks - I also plan on going to a "cageless" zoo soon for practice. I'm hoping to get in contact with a family friend who specializes in venomous herps so I can get pictures, which would be excellent.

I shoot with a Nikon D3100, and two lenses - a 55-200mm and a 35-55mm kit lens. I really should get one that goes up to 400mm, but I don't have the money currently.