@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 :