Sorry to bring this up - I'm pretty sure you're an honest type who means well, but the truth is you're asking for a lot of work for only a possibility of being paid; and I've noticed that quite a few of your previous posts are doing the same.
Personally, I'm not a comic artist but I am a professional mural and portrait painter, and I've long since given up even a brief consideration of such requests. I expect you don't know how much you're asking of people - it's an incredible workload and a massive chunk of someone's professional time, for which they could be doing something else that is guaranteed to pay the bills.
Apologies for being so blunt but it is something of a personal bugbear of mine. Believe me, I'm speaking from experience - I took on many low-paid or free commissions, and they only got me the reputation of being a pushover. It was the paid jobs that made clients start taking me seriously. Imagine asking, say, an architect to fully design a building for which they may well never get paid.
Here's something I found all too late, but it changed everything for me.
http://shouldiworkforfree.com/
