I like graffitti shots, this one is nice. I think I might crop a little to lose the sky as it distrcts me a little. In a perfect world (mine) I would have loved to have gotten elevated and shot it dead on. I reallylike the colors though, Looks good.
The first is a NICE example of graffiti in a photo, made special by the diagonal line that goes right through the frame. None of which is your doing, other than SEEING it, and that is a major part in determining what is worth a photo and what isn't, isn't this so? So there: yes, I like that one!
I also like the second, mind.
No one will take the "Keep Out" seriously any more, I guess... the way it is, it is no long THAT awe-inspiring!