I am new to conceptart.org and concept art in general, but I have the opportunity to do some freelance work for a movie studio that is in the beginning stages of a film. What they are asking of me is to illustrate 4 scenes from the movie's script which they can then use to go and get financing. Fairly tight finished colored illustrations. I have no idea what a fair price is for this. Can anyone give me some pointers? Also if this isn't the best area to ask, please guide me to a better one.