I am slowly but surely working through to get everyone a CG! It's one of my immediate goals but feel free to let me know if there is a character in particular you'd like to see one for sooner and I'll try to push that one to the front of the queue.
As for requests, I do take free requests for additions to my free to use sprites. Things like outfits, CGs, and new poses, etc, are fine to request and I tend to bump them towards the top of my to-do list. They are free, of course, as long as I can make them free to use for others as well.
I hope that answers any questions, but if it didn't or you have more, please feel free to ask as many questions as you like!