@Rodidon : For street , search on CG Textures, or other photos on google and if needed make them tileable ! Yours have too much noise, thet looks too much agressive to the eye ! you should blurr them to try, but yes you should target photo textures, and you don't need a thousand, only some of great quality !
I finally found how to colorize a baked normal map : Just use Multiply in the selection of the tool option panel. That's good, now i can keep this method to make 3D characters and just paint highlights or shadows :