This has such a calm and hopeful feeling! Probably like the music Snape has been playing. Severus looks like he works for some Institute or the like, and comes outside to the terrazzo for a break, sitting down to play something that relaxes him. And Harry happens to wander in. Being Harry, of course he's *wandering* fecklessly, but of course his luck also guides him unerringly to what he needs.
I like how the hair and the slight bit of weight and rounding to them show how the years have elapsed. Severus has, thank Merlin, finally put a bit of flesh on his bones, and he looks like life has finally relaxed for him, easing him into a dignified middle age. Harry looks very much like a young father, in his early 30s, and I love this! I think I rarely see a dad!Harry who's not a "boy" any more, but a man.
The background and details are so lovely and inviting! I just want to be there egging them on beaming happily.