An oval face looks best with a classic short cut: short on the side, and slightly longer on top, either with a side swept part or not. The trick is to not wear your hair down on your forehead, but backwards, to avoid making your head round. Creating some angles and volume on top can sharpen the face a little bit. I’d even go further and say a man-bun can look great on an oval face shape. Long hair as well, at least in theory. And of course a variation of the undercut.