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.
{Article} Does Art Reduce Stress?

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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