So cool! The picture itself is great and I love the concept behind it with the main character being the 'dad'.
However I do agree with Ih4te below: I think the backround detracts from the image on the black t-shirt. Perhaps the blue glow would work better on white, but I think with the black background perhaps no glow or a very light 'border glow' following the outside of the outlines might work a little better.
I like it! I'm glad you tried tweaking the background glow; it looks great like this. I thought at the time I wrote the previous statement that it would look nice on white but now I agree that it works really well on the grey shirt which you've chosen. Perhaps it's because the grey brings foreward the white highlights on the dad while still allowing the darker areas of your image to give impact. Or something like that. Really, all that matters is that it looks nice. ^^