Flowerhead neigbourhood

This was photographed yesterday on my way back from a rather unsuccessful visit to a local pond. My camera was still set up for birds (150-500 mm) when I came across this butterfly on a flowerhead besides the trail. As far as I can tell, it is a (Western) White Admiral (Limenitis arthemis rubrofasciata). I saw that some insects were on the flowerhead as well, but I did not see the crab spider (at the very left) until I viewed the image on the computer.

The photograph was taken at 500 mm and at the minimum focusing distance of the lens. After returning to my vehicle, I switched to the macro lens and flash, and went back to the location (15 minutes). The BF had flown away (no surprise there) and I did not yet know about the crab spider. So, I spent some time with other insects.

Canon 7D, Sigma 150-500 at 500 mm, f/8.0, ISO 400, 1/640 sec, monopod, natural light, LR5, PS-CC and NIK suite.

I decided to leave the OOF insect at the top as it is part of this flowerhead community and because IMO it provides a counterpoint to the critters in the lower part of the image.

All comments are much appreciated. Thanks for looking and thanks for all your comments on my other photos.