Based on the thumbnail alone (and being able to see your title) I can't tell if you're a design channel, or a gaming channel. Gaming channels interest me far less, but design channels are far more interesting to me. But that thumbnail doesn't speak "design" to me.
What could help it, is keep it more or less how it is, but add a photoshop/illustrator user interface menu AROUND the thumbnail almost like a boarder. That will help communicate visually the design side of things