How about now? I even changed the color of the brick that way the icon pack will be able to go with alot of dark-styled setups.
Standard Windows light-source/shadow protocol has the mortar joints protruding from the brick face, not raked [recessed].
Even tuck-pointing won't give you that exact effect.
Again, if you are 'trying' to depict graffiti it NEEDS to be less 'perfect'.....unless your graffitist is using a stencil cos he has no clue/talent....