O_O, i never noticed you rendered even those strands! >_< man, i'm a bad renderer, i always omit those....
Oh god, lolno. I would die from patience before manually taking out tiny strands like that. Also, the pentool
is not suited for extreme fine-precision (hair strands, etc.) other advanced extraction methods such as channel masking, etc. > pen tool in those cases.
The technique I used for extracting Homura-chan however, was a combination of traditional pen-tool rendering and the
background eraser tool in photoshop, which does wonders in terms of removing a single color from the background, and becomes especially useful when you're dealing with anime-like art with transparent colors ontop of a solid background.
Please refer to my post in the
last page and open the "slightly NSFW" spoiler for more details on this technique.