I've been meaning to do this for a while - paint an example of how value does all the work but color gets the credit. After painting this one above, I did this other version where all the colors are in the right family, but the values are mostly wrong. You can see how the colors are still interesting, but nothing holds together - the scene is only vaguely 3-dimensional. Honestly, I could have (and meant to) push it a lot further (make the values WAY wrong), but my brain pushed back against it. I will try again someday.
Value is the number ONE thing I end up helping my students with. If you want your painting to look 3-D, you've got to get the values right.