I use the Pen tool, and nothing but it. It works insanely well for cutting out just about anything. I'd highly suggest you switch from the polygonal lasso to the pen. I agree, your emblem is quite bad. I've found that my orb avatars look pretty good when slapped on renders. I also create a new style with all the orb avatar effects, and then I create text with that style that says "rendered by RaVNzCRoFT". Also, when posting renders on this forum, post them on top of a black or neon green background, so we can see choppiness.
For example,
this. It just looks good, in my opinion.