Check it out. Get one and wear it whilst you fight supervillains (or various other maniacs who have scary red skulls instead of faces). Be the envy of all the other folks who love grungy superhero iconography.
Here are some other great images from McPancakes. (These aren't on T-shirts yet, but perhaps someday...)
She's boss. Keep an eye on her.
Jade's Stock Usage Boilerplate
The rule of thumb with my stock is: (Almost) No Rules. Do whatever non-commercial thing you want with them. Use them for pose references. Create astounding composite images. Tweak the saturation by 1% and call it art (perhaps it is). Print them out and use them for target practice or make origami stoats. If you are inspired to DO something, then I am happy. You do not have to credit me or show me what you do with them, but (as any sane person would) I would love to see what you create.
If you can somehow use them to help you make a little dough that's great, just contact me so we can work something out.