Had Radiesse yesterday in my cheeks, I look like maleficent, is this just swelling? (photo)

Love the description!
Without knowing more like how much was injected it's safe to say that swelling is the culprit here. It will likely max out on day 2-3 then taper down.. 
Expect all the swelling do gone 1-2 weeks after the injection. Hope your look softens a bit so that you love it!
Hope this helps and God Bless!
Dr. Robb

Radiesse is an FDA-Approved filler that we use very frequently in our office to sculpt the contours of the face. Since we are a national center of excellence for filler reversal, we also encounter patients from other doctors' offices who wish to have Radiesse fillers removed for one reason or another. In our office, we employ a directed technique to visualize the filler material, if possible on ultrasound, and then use non-surgical methods to dissolve the filler or granuloma tissue using intralesional injections. There are many methods using a combination of enzymes, intralesional modulators of scar tissue, and Kenalog to help reduce volume and remaining filler. These techniques require meticulous attention to detail and can be performed at intervals of two to three weeks to achieve longterm effect.

Best,
Dr. Karamanoukian
Realself100 Surgeon

First of all, nice use of the word maleficent :) Appreciate the vocabulary.
As for your issue - it is most likely swelling, as it is very soon after the procedure. If you are concerned you should have your doctor reexamine you. If it is swelling, gentle massage and/or icing can help, and it should go away over the next week.
Hope this helps! Best, Dr. Cabin