Thanks guys!

@ThomasR : bonne nouvelle, je m'entraîne avec celle-là pour la carte de Saranie !
@Kacey : thanks, it's time consuming but it helps me a lot work 3D first.
@ - JO - : I will rework the shadows a bit, notably because I'm adding some little elements.
@Mouse : please, go ahead ! It's not "my" technique anyway, I shamelessly stole it from brilliant guilders as Larb (and I think J.Edward is using it sometimes too) .

Damn it's long! A bit more...
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I also need your advices... I have absolutely no clue of how I could draw the roofs for the industrial buildings with a half curvy shape. Any idea?