Two things strike me.
1. I didn't use the lasso tool - just applied the mask and used eraser tool. I intended to use
the lasso tool, but, for whatever reason - when I finish making my outline, and release the mouse button - the lasso disappears. Couldn't figure out how to fix that.
2. After I apply the "alpha to selection" - the outline lines disappear, and I basically am back to the original picture. Obviously, I must be missing a step somewhere, but haven't yet figured it out yet.
I'm reading everything I can find on the net, trying to better understand the basics, but still trying to figure out what the problem is here.