Dana, The Yellowstone pics were gorgeous. I sent you a PM regarding comments.
Looking at this painting, the table feels like it is slanting down and might be why the plant did not look right. Also the shadow line should not be on the wall. It should actually start some place on the table taking into account that the wall under the window is blocking the the light on the part of the table closest to the wall. I hope I'm making sense.
Once you correct the window light on the table, then putting something on the table will work, but not before hand. Hope tyht helps.