Cute! There definitely are some lop mixes that have one ear up and one ear down..we like to call them “helicopter buns”
Like Sarita said, on this forum we recommend that harnesses/leashes do not be used on bunnies. Before I learned more about bunnies I did also try to use a harness on my bunny, but it can really be quite dangerous. Although they might seem calm on the harness, bunnies are prone startle and bolt at any time from a sudden unexpected sight or sound (which there are plenty of outdoors)…if this happens while they’re on the harness, they can become entangled and severe injury to the back or legs may result. I know it sounds like a worst-case-scenario sort of thing, and it’s easy to think “oh my bunny doesn’t startle easily, so it’ll be fine”, but all it takes is one moment for injury to occur and we have had members here who have been through this heartbreaking situation. Just something to think about!