Some progress today...

I think I'll have to re-do all those houses. As I couldn't find back the settings I used before, the gap is too big between the "old" and the "new" houses and... it's not satisfying to me. Thanks to the magic of the layers, it won't take too much time, fortunately

I changed the desert pattern with two layers filled with two different patterns that I multiplied. I don't know if this is better or worse than before ; just different.

Any suggestion, criticism... welcome

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