Use the right entrance
Standing in the wrong line will cost you time, so choose wisely. For individual visitors, you should use entrance A along the Seine. Prepaid priority tickets should use entrance C. Also keep in mind that the museum is free for children under 18.
See the most known works by Degas, Renoir, Van Gogh, Monet, Manet, Seurat. They're all here, and since it's a small museum, you can squeeze them in on an hour!