$75-$100 is a good price for independent artwork. It is a fair earning especially when the artist takes care of all the visual aspects, such as pencils, inks, background, color, speech bubble, effects and such.
While at the beginning it is a good start, I, on personal experience believe that is way better that the Writer/Author has already a script prepared so the artist can work, a script that details each panel, is easy to understand and it's not a Narrative Text where the artist has to guess what actions are going to be draw, from which angle, guessing or having to ask the writer how to arrange the panels in the page. And don't forget the setting or character references, it doesn't have to be original artwork but something to fabricate the idea, the preparation for the comic.
The better organized the client is, the more efficent the artist works.
I mostly say this because I get people coming to me from time to time to offer me their comic ideas, but they never provide a script, they just talk about pricesand then they just put their novel link and honestly, building, deciding, debating is not my thing, I'm someone who rather follow indications and tasks. And then, when I ask for a script their answer a "oh I'll work on that" or a "But my story is right there, you can work with it" and honestly... I can't, it has unclear instructions that'll make us waste time, or well, they say they'll come up with a script version but they never do.
So again, everything you provided in the means of price, revenue and credits is ok. So once you decide on an artists based on their style, payment, and indications about how they work, the better thing is to provide the script and references because that way the artist can get to work faster so you can have the product faster and it's something organized that you decided, and not something that you and your artist will have to revise and then modify or decide what to fix if one of you isn't satisfied.
