Question about Illustration contract

[yivgeni]

I am doing an illustration at the moment, and have just gotten a contract. I would like to ask the writer to get commissions from every book sold, in percentage.

I am pretty sure this is common practice, however I do not know how much exactly. Please, would you advise me of the acceptable rates?

[Qitsune]

Is the writter offering you a decent base rate? Because royalties are a pain in the butt, they require that someone audits the sales OR that you trust the writter/publisher blindly. If you are just starting, it's usually not worth the trouble to ask for royalties.

[yivgeni]

Well...the base rate is not crazy high, the job is pencil drawings 8.5" by 5.5"
and it is 75$ per drawing...so i thought to ask for royalties.
I thought perhaps just make the calculations every year, or something, shouldn't be that hard, should it?