ALSO, be sure to add on for your time/money on study and supplies when setting your hourly.
If someone asks for watercolor on stiff paper, take into account how much your watercolors cost, how much your paper costs, the amount of time you’ve spent on the project and the amount of time spent building that skill.
To calculate that:
Cost of raw materials * percent of usage = cost of the materials used for a project.
EX: For paper, (price of pack * size of pack) /#of sheets used= cost
(I tend to say about 5% for pencils/brushes and 10% for pens/paints/inks on relatively small projects.) - This applies to your digital materials too! Your tablet takes wear, your pen nibs take wear, your computer takes energy to run, your art program has costs…Take those into account.
And for your time spent studying, there are two ways of thinking about it:
“I went to college”: Approx. tuition for your art classes * percent of knowledge used = knowledge put into the work. I would use about 0.2% up to 2%, some people will use more, and certain projects will use more. This is pretty much whatever you think’s fair.
“I spent my years studying on my own, barely paid a dime.”: This is fairly subjective, but, I say about 0.5 to 2 cents per each year of study.
Think of it this way if you’re one of the “I’ve been drawing for as long as I remember” people: When did you get serious about drawing, and start actively deciding “I’m going to improve my art to a professional/expert standard” count the number of years between then and now. For me, it’s about 8 years. So there’s basically a flat $4 on all my work for the mear fact I’ve spent time actively learning how to improve my art.
A combination of those would be really to use your personal study time, and then add a small percentage for paid-study.
So, I’ve taken 3 5-credit college art classes, which together costs around $1200 SO about $6 is the base cost given my time and money spent on learning to art.
Therefore: My cost for an hour of digital work, with the base of the US federal hourly wage (just under $8) would probably be around $25. And this using my MINIMUMS. And my minimum is probably different than yours.
YES, I know it feels weird asking very much for something you have spent your life doing in such a natural way, and it feels weird asking for much when you are always looking at other artists’ works and not thinking yours is The Best, BUT, your works are valuable. And, when you ask so little for your art, you cause the entire online commission artist community to either lower their prices or deal with messages about how “Outrageously High Priced” their commisions are. You devaluing your work hurts both yourself and others in the long run.
Your time and effort have value. Your use of materials has value. Your knowledge has value. Demand for that to be respected.