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His original copy, as I've checked and I hope I am not wrong, doesn't have those curls too. :)

Yeah, you are not wrong. I reference it on another cafe's painting that I is more erratic and with curls.

I guess it was just the line, vivid colors, and texture which made his work recognizable.

Yeah, that is one of the prism of Van Gogh's signature style. The curls that I was referring was on his other art style that is more erratic and unstable in nature.