Personally, I am not a big fan of the bricks because it seems "busy" to me but it isn't horrible. I like to make things pop as much as I can by using high contrasts between background and foreground text.
That whole "Next Level Playing" logo won't translate well on a thumbnail as far as visibility goes. You might have to blow it up a bit more. What is the bigger focus? The logo or the guy's face? I am unsure what is more important.
Also, in order to see your face more on the thumbnail, you need less of your body. I am not sure if it is intentional that you pulled back on the image. Personally, I would zoom in more.