Outer corners of the eyes look droopy after an upper eyelid surgery, what's causing this? (Photo)

Hello, I’ve had an upper blepharoplasty 6 months ago, but the outer corners of my eyes look strange. They look droopy and downward and it looks like and arch facing downwards has been formed. I know I’ve had inner stitches too and in the first weeks post-surgery my eyes actually looked quite lifted. What could be causing this? It does not look nice at all…