It's great for a first picture! Glad to have another artist. Here are some tips to help you get started.
![Smile :)](./images/smilies/icon_e_smile.gif)
-Use the smoothing option. In the left corner, tool options like "size" and "smoothing" are there. Turn smoothing to a high number, but not too high. 83% is a good number.
-Color using layers. Make a lineart layer, then make a color layer under it. So you're coloring dosen't interfere with you're lineart.
-Keep on practicing! =D