How to assert a price tag for oil paintings?

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Today I went to an antique dealer's house with my dad and his rich friend. The buyer wanted to decorate his house with paintings and I was brought in because my dad thought I have some eyes for good painting. The old guy told us that the painter was some kind of famous guy and honestly I didn't buy that so obviously I googled it. It turned out to be the painting of a well known Spanish filmmaker. His still lifes are over saturated neon green and red. And they got that gross oily look.

Obviously do you think that this is aesthetically good? Or is it the historical value of it? Arms look all disjointed for me and the edges are blurry. Dunno if it's intended to be a "kitschy style" or not... But I suppose normies don't see it so it is? Since I didn't want to be discourteous I didn't say a thing.

WTF is going on the collector's scene anyway? Is this a new Emperor's Clothes thing? What is this, a new scam plot?

BTW the old dealer had a rare Kandinsky sketch.