You're art is amazing I would totally buy from you (even though I'm trying to save so would have to wait a bit becuase I don't want to be cheap with good art lmao)
I personally really think it's what you think it's worth but I can provide a few suggestions
Full body - around 500
headshot/bust maybe: 200 - 350?
plain colored backgrounds- 3 - 5 mush
multi colored backgrounds (like the first one) - 5 - 13 mush
Background with designs (your choice) - 13 - 35 mush
I'm not very good at prices but maybe start a bit low (or like some of these) until you get more popular and more orders
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