Of course art reduces stress! I learned this as an angry teenager while cursing at the walls of my room. I would get my water colors in hand and paint everything black, hahaha. In any event, check out this lifehack article on stress reduction via art whether novice or pro.
DropaJewel, because someone has to 
It depends.. The use of certain colours can evoke feelings in the viewer or the content of the picture can do the same.. I like pictures with little hidden things within the artwork.. Like little clues. Salvador Dalí was very much like this in his works.
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