Well true- these are not as minimalistic as it could be, and some assets in these example would require some drawing skills, like the huses and the like.
But if you start breaking each illustration down into the seperate assets that make them up e.g. tree01, tree02, bridge. yada yada yada, it starts becoming aloooot simpler- also alot simpler to understand and recreate.
Illustrator would be one way of doing this, but this looks more like photoshop to me.
From what I can tell, id say its its rough one colored shaped, with 1 or 2 tones of shadig, and than some kind of texture multiplied/overlayed on top.
actually- the process for most illustration and the like is pretty simple once you know how its done, but its the skill of those artist, that when trying to achieve the same thing, it seems so much harder for you/me etc.
If you want, this week I have a fairly relaxed time frame, and I wanted to try this style myself, maybe for a future project or something like that, and maybe we can whip up a little
Workshop or somethin.