Hello there. This is Jumana, a digital artist and character designer, whose attention has been caught by your interesting project, which I actually liked so much.
Since I draw in many styles, we shall start with a free rough sketch (of your protagonist) to give you an idea about whom you'll be working with, and once you've approved it and made sure this is what you want, you can award me the project.
Please, check my profile and contact me for any questions (and if interested, the rough sketch I mentioned earlier).
For 'non-flat' colors, I would just add $100 to the $500, so it is $600 for a fully colored 25 comic pages. (with any number of panels you might want)
Looking forward to hearing from you.
Best,
- Jumana.