I would know what kind of style is the following image to make further research please, from the web I have seen they talk abut grunge style, but I can t find more information about the technique, here an example:
any hint would be great, thanks
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I don't think there is a specific name, but I guess you could call it a grunge paint texture. I think it's meant to look a bit like an impressionistic/grungy watercolour illustration.
In my opinion, it has almost certainly been done digitally in Photoshop (or similar raster image editor), starting with a photograph of a street scene, and with the use of a layer mask to reveal photographs of paint textures.
Here's a rough idea of how it could be done
Get a photograph of a street scene, desaturate it, and apply a threshold adjustment. Invert it, and paint in black around the edges with a paint stroke type brush.
Then apply the Cutout filter
Here's a before and after which shows what you should end up with:
Next, find two paint texture photographs (or take your own!)
Create a layered composition, using the black and white image you already created as a layer mask on one of the paint textures. Basically this will mask out one paint texture layer, and reveal the other paint texture layer below.
Better quality example here