itch.io

Legally...

"This license enables reusers to copy and distribute the material in any medium or format in unadapted form only, and only so long as attribution is given to the creator. The license allows for commercial use."  The No-Derivatives bit is just to have some legal backing if it ever gets back to me that someone replaced a spade with a hate symbol or something like that.

If you are saying you are going to directly redistribute the art as a standalone element for free and/or you get paid instead of me... well that hurts, fella. I like dollars. This stupid world runs on some form of dollars. My kids need dollars to eat. They eat dollars. 

TL;DR: Yeah, put them in. If you make more money off them than I do, "I hate your guts forever and wish you the best of luck creating your stuff!" The credit is perfect.