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[Character Drawings] $30-40 depending on complexity/detail
[Creature Designs] $40 and up depending on creature originality (simple species mix or designs for existing species should be priced less than creatures and species you create from scratch)
[Reference Sheets] $50 and up depending on complexity, how many drawings of the character they want, how many boxes, accessories, etc.
My personal opinion on what I would pay, etc.
It makes me sad to see brilliant artists underprice their work just because the majority of people on DA have grown to expect cheap prices.
It's not fair to the time, effort, and creative design artists put into their work
People need to realize how lucky they've got it that some of the neatest artists here are pressured into underpricing their stuff