Help with Pictures

I’m having a difficult time with my pictures. I am looking at other listings and all of their pictures are crystal clear and it looks very animated. Doesn’t look the real life product. What are they doing or using to achieve this? Are there any how to videos? I’ve tried Canva, but as easy as Canva is to use, the quality sucks. The moment I download and upload it to my listing, the image is all pixelated! Plus it doesn’t look clean/AI generated like everyone else’s. Help!