I really like what you did with the first one! 🙂
Also, a tip... if you're gonna use the eraser in order to cut things out, make sure to use the fuzzy one. Once you have most of it cut away, switch to a smaller fuzzy to keep things as smooth as possible, and don't be afraid to zoom in on the picture to get detail better. 😉
And read palabra's posts! She does amazing, amazing things with GIMP. 😀