I've just charged whatever comes to mind in the past, however it doesn't seem that beneficial all the time, I usually charge 5-15$ for emotes and like 50 to 80$ for a big piece or animation, in the future I would like to charge hourly. What about you?
A few considerations for pricing:
My ArtStation portfolio
My Twitter page
I personally think that Hourly is the way to go for custom things, and whatever double the minimum wage is in the area is what I go for with Graphic Design commissions.
If it's something that is mostly templates, like a custom name banner or a recolor of a patterned design, then I just charge a flat rate + extra for any additional changes that need to be made.
My system is based on an hourly rate thing, the general price ends up being ~$25 for 4 hours of active work.
JamesTDG - Lead Dev of Alternate Worlds Entertainment
Currently my rates are at 20-30$ per hour depending on the scale of the project, however I plan to raise once I have enough experience for myself and more commercial pieces under my sleeve.
I'd probably go at least $25/h, though I really prefer to work for single predefined price, because I suck at staying on a single task for a whole hour and recording my times. When I have a single price it forces me to work faster as they longer you spend on it, the lower your hourly earnings go. I think it's also easier for indie devs to control how much they're spending.