I want to sell a forgery to an art gallery.
Wow, why? Are you aware that making a forged painting is breaking the law?
Yes, but I need the money.
Art forgery is like taking another painter's property for your own. You trying to sell a forgery you made is wrong. Paint your own paintings and sell those.
I'm sick of being poor, I'll risk everything for some cash.
Art experts would find out it was fake quite quickly. Why not use your skills to paint a new and original piece? Or you could just get a job like normal people if you need money.