That's perfectly understandable. We've all got to learn somewhere, right?
One tip/trick for doing the triangles on the tail:
Make a new layer. Choose the lasso selection tool, but the one that's got a rectangular lasso (it's a point to point lasso), and select 3 points in a triangle, ending up where you started. THEN hit the modification key (ALT in Photoshop, whatever it is in gimp) that deselects an already selected area, and make a smaller triangle inside the one you just made. Match the shape and placement as best as you can.
What you've done is create a shape, then cut the center out. Now take the paint bucket and fill! Viola!
That way when you do a triangle you get sharp edges instead of round ones, and the look and feel come out a bit better.