would have gone with a brighter shade of grey for a base of the city and left it with some serious underspray to make the light aspect look more real without too much more effort. then gone over the same stencil from a distance with the darker shade so the borders arent totally filled.
a friend of mine used to make some pretty amazing stencil stuff when he was in school, check it out
http://n0ddy13.deviantart.com/gallery/

look how he uses colour in his streetscape and the eifel tower
and how he uses the underspray in his pain/anguish/destruction pieces to create the light/glowing/blur effect

ah ah i found some funny stuff related to graffiti today
http://senseslost.com/2009/02/21/mon...i-spray-paint/

u didnt think to use the silver instead to use white?

The whales and the final product were / are both great

still.. the background is a bit bare... to much black there

Its fine. its only black because it's supposed to be, i mean, you're looking at it by an artist standpoint, when this was only meant for "national television" Any veiwers would think its great!! Hell,i think it turned out amazing.

thnx uall, and phy is right i think. im used to fall between, the writers thinks im an old nerdy artish figure and the art community thinks im a dirty writer, and then its the tb world whos design and photo shop born and bread. so as long im happy myself its a success by me..