I'm trying to get better at painting in PS, and the current project is making a decent looking middle eastern street, with houses and a bazaar.

this is the first house + a rough sketch of the ones next to it.

Click image for larger version. 

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the biggest problem IMO is that the painting gets too "cartoony" - i'm trying to stop making dark thin lines to separate walls, but it just doesn't seem right.

any advice would be most welcome