Very heavily saturated yellow comes across on my display as being quite unnatural. The shop sign could almost have been created in MS Paint with a yellow floodfilled rectangle with the yellow and red colours coming straight from the default colour picker.
The high key yellow-ness might have been a bit over the top? I still like it, I think it's a nice image... I do wonder if it would have been better without that dude in the shot... but that's only because I like simplicity =p Good luck
that's really convenioent with all the yellow there. yet, it's used as an accent to the grubby urban city type background. i like it. not too much yellow to scream at you. just enough to brighten up the photo.