I was doing research as I normally do pertaining to illustration and decided to check out a site, which I heard people were selling their book illustration skills for next to nothing__ which I think is insane. Anyway, I noticed this image that I thought I had seen somewhere before @Will-Terry. I am pretty sure this is your image. In light of this, I'm thinking it would be a smart idea for all artists to start searching that site to see if their work is being used. I searched it under "children"s book illustration."
I have total love and respect for all you guys do. There's no signature, but I know this image advertises your video, I am sure you would not want it on that site. By the way, if this post is in any way inappropriate to you, I understand if you delete, but I thought it would be smart to alert all of us who are artists with portfolios online.
For December's third Thursday, a good question would be: "What should I be doing now to protect my work? Have any of you encountered this situation before?" @Lee-White