The bottom photo shows the side of the springhouse in the last rays of the sun before it goes behind the ridge (about 45 minutes before the actual sunset). I increased the contrast by just a little. The foreground silhouettes are cattail leaves.
I’m no insect expert, but it looks to me five different species on the fleabane. The one in front appears to be an Italian honeybee. To its right and left are wasps, and the ones at the top are flies. That’s all I can tell you without further investigation.