What are your prices?
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I leave answer there for others too.
It's can vary from size/complexity. But I don't mind hear your suggestion depended on your budget and needs, but in average:
1. Concept art: 20-60$, depended of how much details should be there - Simple like in example will be the lower price. Finished version of my last concept art on twitter (not sketch that posted, but finished version of it), will be around 50 because there is not just how character look, but also details of how work parts of character and parts itself is complicated.
2. Illustration: 10-60$, heavy depended on background existence and character in it. Just characters illustrations for conservation scenes or profiles have lower price, and complex illustration for important scene is higher.
3. Assets: I sadly can name only after hearing about with what I need work to. While sprite is relative easy deal, my animations is hand drawn (I mean they done by frame animation and not with spine), so it is a complex process that cost a time.