Help/ advice someone wanting to buy my artwork for their ESPORTS team
I need some help or advice...I recently got messaged by someone on deviant art asking if it would be okay to buy one of my artwork of an Oni mask with a dragon wrapped around it for an esports Team he is trying to start up and the design would be their logo...How should I proceed because I've never had anyone ask to buy my artwork especially for an esports logo.

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For example if say materials cost $20 and 15 hours too produce, pay yourself an hourly rate of $20 = $315
Anyway just a rough estimate in how to price your work.
Cheers.
EDIT:
For digital the same applies, except materials (...obviously I had my analogue hat on : ) ) can be calculated as tertiary costs such as plugins/brush tools/paid tutorials...etc.
We have more info here about how much to charge, how to write an invoice, how to get paid, etc.
http://wiki.polycount.com/wiki/Freelance#Freelance_Rates