Wow, the minimalist approach. I actually find the writing and two dots to be too distracting. I wonder if we could have figured it out without them; I bet we could. And it is customary to have some part of the photograph in focus - or all of it quite out of focus. To make all of it just a bit out of focus will always convince us there is a flaw in photo.
I really like the idea, the lighting, the composition, and so on; but the flaws really get in the way.
If the title wasn't "Dear Bob" I would have never understood what was going on here. The picture should do that without help from the title, in my opinion.