If you are interested in a premiere software solution for print on demand, Affinity Photo is pretty great. I use it quite a bit. As a long-time Photoshop user, I can confirm that it has a similar look and feel to Photoshop. In this video, I cover three reasons I love Affinity Photo and provide a quick overview of the software interface.
Links:
https://affinity.serif.com/en-gb/photo/
Timestamps:
00:00 Introduction
00:21 Reason #1
02:30 Reason #2
03:16 Reason #3