I have a blog of my own, and I have been getting requests for converting pictures into SVGs for them. I'm getting overwhelmed in my email box. I was wondering if I could just post them on my blog for anyone to grab.
Problem: I'm worried about copyright or trademark infringement. I tried reading more about it, but I just need layman's terms or simply explain to me as if I was a 5 year old.

I'm simply converting coloring pages or images into workable SVGs, also making sure it's for personal use ONLY. Am I in any violation here? What about logos like Seahawks, Colts, Etc?
I know a lot of people wouldn't even touch this topic, but if anyone knows about those "laws," please please please do explain what I can do/ cannot do.
MILLION THANKS!