Find a painting that you love. I choose La Danse by Matisse because I love the color palette and movement in the piece. Use a color palette that you love, this could be completely different from the original painting. Sketch it out, then begin to paint it in a similar style of the original piece you love.
Not sure what to paint? Check out WikiArt!
"I do not literally paint that table, but the emotion it produces upon me." -Henri Matisse