Welcome. Really liked your shop and products. Very pretty.
I would like to suggest that you restate the dimensions of the images in the description. Cause I don't think you did that on all of them.
Otherwise I think I liked the watermark on the Family tree best, it left the rest of the image clearest.
As a suggestion that goes beyond the critique you asked for, maybe you could offer other file types? (I know I would have liked to get your product in a .png file. I think that would have been best if I wanted to get it printed. But I do not know if that is a realistic option.) Also, your designs are really pretty, so maybe you could, at least after a while, think about cooperating with a local printer and offer a kind of upgrade to a physical item?