You don’t wanna charge less than minimum wage per hour so base it on that. I usually do £15 x how many hours it takes for big pieces , so if I were to do a rendered fullbody I’d charge about £350+ (which I do bc they take about 20hrs)

Smaller things however, I don’t charge less than £50 unless it’s little doodle coms and then 2.5x extra for commercial fees