As far as I know the painting you are showing is one of the most valueble paintings in the game. I has to be, because every time my sim paints that there is a difference in $1000,- till $2000,- compared to her other paintings. But what the painting must look like, I have no idea. The only thing I know that if it is getting black and red, your sim has started painting a money maker.
I've noticed that this one goes even up to around $6800,- if you're lucky. Of course, to reach that value, you have to be a creative painter, level 10 and extra creative. Not only that, you have to paint a lot. And with a lot, I mean over 300 paintings. And believe me, that won't take that long, because your sim will get faster every time, even with huge paintings. In a good mood, my sim can now paint 6 huge paintings in a row without need to have a break, and mostly at least two of them are masterpieces, or at least genius ones. Forgive me if I have that last word wrong, I have the Dutch version of the game and litterly translated the step between a normal painting and a masterpiece is the one I was talking about. I believed it must be genius in English, but I could be wrong.
My Sim Ozzy Osbourne is painting a lot right now. I'm seeing him paint the same picture in different styles. One was clear, then next time it was blurry. He's done this several times now. Here's a $3,500 masterpiece he painted and I have no idea what it is.