Okay, let’s calculate. Peter has 59 years of experience, which is extremely long. For an artist/illustrator, this is unusually high. Typically, experienced artists charge by project or hour. Since he owns his own business, let’s consider his experience as a factor in setting his rate. A rough estimate for an experienced illustrator might be $50–$150 per hour. However, considering his extensive experience, I would estimate his rate to be on the higher end of this range. For a location like Scottsdale, Arizona, the rate might be slightly lower than in major cities. So, I’ll estimate around $125 per hour, considering his expertise and experience.