Solid work. Going to echo/agree with Add3r here as I feel it's important. If this was simply personal work without context, bumping the contrast may present the work better, but as in-game assets, the world's value/contrast range has to be more neutral so that the buildings and characters pop visually [and to align with…
I would imagine the object space map is to get the top-to-bottom directional light for assistance in the painting process. http://imageshack.com/a/img706/3888/9cop.png Here is a link to some info provided by other helpful people who work at riot! I believe she goes by Terrabite, and was done for a project called Blubber…