Size: whatever you think is best
Text/quote: None unless you think of a nice and creative one that goes along with the picture :3
Matching avatar: yes plz
Anything else: feel free to add in whatever you think will make the siggy better. And can the colors you use try to match the picture. And have fun with it too.
Plz take your time on this. I'm patient enough
and your siggies are quite amazing!