Question

What style did Vincent can Gogh use, and if and why opinions regarding his contribution to the art world have changed over time.

Thanks
-MC
Writeacher
Van Gogh is considered a post-impressionist painter.

Read carefully:
http://www.vangoghgallery.com/misc/bio.html

http://en.wikipedia.org/wiki/Vincent_van_Gogh

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Your "if" and "why" questions are for you to answer based on your impressions.