If you are posting other artists' work, you need to first have their permission, and second you need to cite the source of the artwork, to give credit to the artist.

You say in your posts that you are an artist yourself. How would you feel if you saw someone else posting your artwork and making it look like they were the one who did it - plus they were getting paid for your work?

Also, now are any of us to know now if any of the pictures are actually your own work? Do you have a way to prove that they are actually yours?