Ellipses are notoriously difficult to represent but I can share a few tips that can help make them easier. An ellipse is a collapsed circle and we have to draw and paint them often in still life. Jugs, vases, cups, mugs, bowls all have ellipses.
The way we see the collapsed circle depends on where our eyes are:
Take notice of where your eyes are, are you looking down on the ellipse, is it at eye level or above?