What Price to Charge??

You asked how much?
Someone has asked you do an assignment which consists of about 60 or 70 specific shots for a brochure. Out of the blue, you ask me how much I think you should charge because you have not ever done an assignment such as this. You know you can do it because it involves one or two models and the Art Director has offered to be available at the shoot to better define what the shot is about. The assignment sounds like the model poses and you shoot. You point and shoot. The other consideration is you really want this assignment.
I will not answer the question. I suspect that you have some price that you consider as sensible and you feel comfortable quoting. Whatever you think is best for you is best for you. That is you.
Nevertheless, I think you should ask why you? Why are you being asked to quote on this assignment by this company or art director?
Put yourself in the art directors shoes. You select a photographer for the assignment.
On to the Internet and find 10 different photographers.
Open each of their web site in a different browse tab.
You should have 10 tabs not counting the search engine's.
In each tab go to, what you think is, the best photograph put up by that photographer which is representative of something similar to what the assignment requires.
Look at the photograph in each tab and select the best of the lot. This should supply the best photographer for the job based upon what the photographers have posted as examples of their photography. Sort of a resume in some ways.
When you have found what you consider the best photographer for the job; ask yourself if that photographer's price is higher than the photographers that were not selected?
If the price is higher, considering what you went through just to find that photographer, would you go with that higher priced photographer?
If you though the price was not right, what would you do now? Remember, you have already told us that you did not know what the price should be.