Seeing the mess ups in the mirrored view

I never used mirror while painting but tried flipping the pic horizontally and realized it looks pretty messed up ( image on the right ). Pretty disappointed in myself but it’s all learning experience. The next piece I’ll use hand mirror to frequently check during the early stage of grisaille. As with this one I’ll see if I can fix it tomorrow. Just ordered a hand mirror from Amazon. I’ve heard of using “black mirror” also which I’ll look into using as well