We had mountain screenshot packs, water bodies, farms... the next category is
«cliffs and rock formations» 
It’s cool when you know people who actually studied the geology and can make a hint how exactly certain type of rocks must look.
Okay, lets rank our favorite ETS2 Map DLC with your favorite at the top and least fav at the bottom!
Actually, the only DLC I can surely name its place is
Going East! 
. The same quality level as the 2012 game map plus
tons of sunflower fields make this DLC the least favourite. Top DLCs are very close in the enjoyment level, but for now I can say my favorite is
Iberia due to its size and the detail quality. The next one is
Vive la France and then comes
Italia. France has very balanced map with fair amount of freeways and secondary roads, Italy has a lot of great scenery, but not so much territory (although Sicily and Sardinia add big amount of sunny screenshot material) plus its toll booths sometimes annoy me with random
Telepass gates location — In France, you may always follow the leftmost lane and never change it.
Scandinavia is already showing its age

.
Road to the Black Sea has a lot of details, but the slow-paced driving (somewhere the pieces of freeway appear only if there is no other way to connect two secondary roads

) sometimes makes me mad. As for eye pleasing, this DLC is still among the best ones

, the same with
Beyond the Baltic Sea, but Estonia, Latvia and Lithuania have to much slow roads, and the user-available part of Finland is too small.
So, this is my tier list:
Iberia
Vive la France
Italia
Scadinavia
Road to the Black Sea
Beyond the Baltic Sea
...
<big, big gap>...
Going East