WOW. My 2nd DD! Thank you, that's awesome!
The creation of this photo was fairly simple in terms of post-processing. As the photo is originally RAW-format, I increased saturation, contrast and sharpness. I added brightness adjustments locally on the chickens, and darkened as well as blurred the background. This separated them from the wooden wall and brings a lot more "mood" to the photo. The painterly look probably originates from the soft and limited light, some slight blur due to a slow shutter speed, as well as the texture on the feathers.
Their heads all pointing in the same direction was pure luck.
Hope you like it.
As with all my photos, the camera captured the moment, I did the editing.