Duchamp had a comparatively brief career as a painter before drifting over to other activities including his passion for chess. His most famous painting, "Nude Descending a Staircase" was a mix of Cubism and Futurism. I mention it and an early, more naturalistic painting here.
I revisited the Ringling Art Museum in Sarasota, Florida in May and found the portrait of his sister-in-law that I featured in the link above, and also found several other early Duchamp paintings. As often happens when photographing paintings in museums, images of two of those paintings were too blurred to post here. The others are presented below. Click on them to enlarge.
The point I make with these images is that while the early Duchamp painted in a modernist vein, it was a conservative variety of modernism.
Duchamp was about 18 years old when he did this landscape.
An establishment photo I took in 2012 that also can be found in my older Duchamp post.
A peasant's cottage painted the same year, but in quite a different style.