
Can't answer the first question but I assume because paintings normally cost a lot of money this is what makes the large sum of black money look less suspicious when given to the "artist" who will probably (whether they know it or not) distribute the money furthering the money laundering process but then again I don't really know

But how do you get your money back? When i looked up for it, i found you either sell it in an art gallery and took someones black money which is looks like legal money or show the art piece as a indemnity to the bank and took credit for it (but not the whole cost) but i did not see either of them in the story. So i was wondering, how did they launder the money?

the whole idea of laundering money is that you have dirty laundry that needs to be cleaned. The dirty money is money that is obtained illegally in some way. has some ties to a crime. in order to make it "clean" it somehow needs to be re-entered into the economy. Money being laundered is usually placed in an untraceable off-shore account or a trust or some other way. the goal is to throw off the trail of the money. once the money is secured, it is then used to re-enter the real economy. usually this means people buying homes, expensive cars, etc. in this case I think that's where the art is tied in. If the money he used to the buy the art came from him committing a crime, whatever that may be, but it got scrambled and moved around and can't be connected to a crime, then that's how buying art can tie into money laundering. hope that makes sense. I'm not a super expert in the area, but I know a little bit.
Ok but how did he made this black money? And (im not a master of this subject) how do you launder money with buying art??