I only do digital art myself. If they're simple commissions, I can maybe estimate how long it'll take me to finish the first one. If one is just a simple character profile, I can easily alternate between the two. If I need a break from one (in order to come back later and see what could be improved), I can work on the other. Most of my commissions tend to be more complex though, with detailed backgrounds and multiple characters, and I don't want to take on too much at once.
Several people have suggested going by a first-paid-first-served basis. I think I may have to take heed and change my policy at some point.
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Several people have suggested going by a first-paid-first-served basis. I think I may have to take heed and change my policy at some point.