/ic/ - Artwork/Critique

VitaminNeko, i looked through your older stuff and it seems that Figures, Perpective, Lineart and Character Design are your strongest areas, with Vehicles/Mechas close by.
Looks like you can already tell a story or describe a character/scene with his shape, gesture and expression, however i think that there are two incredibly powerful tools for setting a mood that will benefit you immensely: Lighting (values) and Colors.
So for your challenge i suggest you to:

1) As a warmup, do 3-10 quick master studies (like ~10-20 minutes for each) of the pictures which mood and colors you love (could also be photos). Keep them loose and focus on getting the general mood and feel of the picture, something like this - http://2.bp.blogspot.com/_pbZw476tEsE/TSJVp_t-8wI/AAAAAAAADpU/AOTGxe4vS2c/s1600/color-roughs.jpg

2) Select 2 line sketches you did earlier or draw a new ones (preferably scenes, not just single characters) and do 5 colored variations of each, with different mood every time (you'll see how the same scene will look completely different with different lighting scenarios).

Link with examples and videos on topic - http://pastebin.com/Y88iFfKF