A couple doesn't really say opposites to me. I can see how man and woman could be opposites but the photograph would need to do more to pitch them against each other to work, rather than the closeness depicted here
Man/Woman? Short/Tall? Either way, not very well represented. The focus is good as well is the DOF, but the people are chopped off. Verticle head to foot would be a stronger photo.5
Given your title, how does this represent Opposites? Aside from that, the image is more of a snapshot. And, both of your subjects are wearing sunglasses, so we can't get anything interesting from their eyes. Bottom line: I'm not sure what you're trying to convey here. Sorry!
The depth of field is way too tight - gives me a headache looking at the background. There is also a feeling of the image being unbalanced which is harder to describe.