The only thing you can do is to gain some weight back to fill out your face or go the dermatologist route and get fillers injected to compensate.
Some men naturally have fuller faces and don't look to bad post weight loss but it does age most people over 30 unfortunately.
Agreed. I lost 25 pounds last year when my first cousin, who was more like my twin sister, was dying of pancreatic cancer. I had no intention of losing weight: it happened without me noticing it much. I just wasn't into eating. Between early February and early June, I went from 200 to 176. I'm 6' tall, and still nicely built at 64, so I didn't really notice it happening (it wasn't exactly foremost in my thoughts anyway), but I eventually noticed it in my face, which I initially attributed to not sleeping well and being distraught. It was only after seeing the gastroenterologist, whose nurse weighed me that I realized that the reason my face looked that way was weight loss, not emotional distress.
Now, a buddy who I worked with at Verizon and is vegetarian, did a purely liquid diet for 4 months, and I could see it in his face at work. He was only 38 when he did it, but it showed easily: his face was just less round and overall smaller, as though his entire head shrunk.
I notice that the fat seems to vanish from the midsection, and the face at nearly the same time for me if I lose weight consciously, which I don't do much of.