ok now since ur walls are so dirty(physical attribute) i would say make it's speculairty lighter
the left pavement is reflecting yellow light get rid of that as well
if you have a car model put it in so you will get a better idea of proportions
like the addition of arrows
make dustbin smaller and make pavement wider
the white straps on the rod make it look used a tip if you have road texture in photoshop with stipes on top just use magic wand tool to sample any colour on the road go to your strypes layer and just hit deleat see if it get rid of just enough pain
above the stipes layer get a cloudy immage mostly grey tones select the strips and deleat wot u dont see so it wont be pure white and will look withered
your speed limit board needs to be a bit less in height i would say knock out 10% roughly board size itself is fine though
will tell you more once i see the changes