Sorted by date: newest first.
Source: http://www.hentai-foundry.com/pictures/user/Ultamisia

Page 12 is a masterpiece,real art there.
The rest is meh.

Base +4

#12 is a screenshot of the game as background tuned with some photoshop. The character was later added in another layer. So if photoshopping a screenshot means real art to you ... well ...

Base +9, shadowangel1337 -4

LoL simplifying background stuff is a common thing,it's not a landscape but a portrait,but you surely would love to see some detailed stone cubes and walls of the background.
So yes,it is an art for me,since i did my homework while you definitely did not.

Base +4

13 hnnnnng
Dat saran-wrapped rear
packaged package

Base +6

https://www.pixiv.net/en/users/3933521

Base +11