Versailles said:

Always make sure to get permission before posting in here, as a lot of artists aren't okay with their art being used in SIM games <3

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The best way to figure out a worth on a piece of art is to auction it. Before placing yourself in a tier, auctioning multiple pieces of art will give you a general range that people are willing to pay. Since it is regarding lineart, I can't give you a solid amount to expect as it varies widely. I'd recommend making a SB for 10k and not putting an AB to see how high up it goes.

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Depending on amount and how comfortable you are with varying aspects of art (coats, patterns, hair, etc.), will be what ultimately places you in a tier.

Bumblebee Stables said:

thank you. I asked for the artists permission to sell it and they gave me permission. their rules didn't say anything about using it in sim games so I asked. i've definitely improved and i'd like to start making more art pieces as practice/for profit.