Most of people who endure graphics learn from their mistakes. Not a bad signature for your level, N, keep it up.
I'd recommend avoiding text in your signatures, the only thing that could possibly be harder than adding effects to your signature is adding a text with good font and textures. Also, eraser isn't used to refine a stock or areas around the render in the way you're doing it right now, eraser is mostly only used to erase unwanted areas of effects not render(s). If you want to do that try using Lasso tool instead.