I think a rooster affects them also. I had a pen with a roo in it and all the hens layed non stop but as soon as I moved him out there were less eggs layed.That pic looks good to me. A tad dark, but egg color isn't bad. I would put them in the green grass and take a pic on a sunny day, that tends to show the color well.
I'm still waitng on the majority of my pullets to start laying. They are old enough. I'm starting to think putting a rooster with them does affect their laying. I put three wheaten/blue wheaten pullets in a pen with a blue wheaten rooster over a month ago and all three of those girls have been laying for a month now. Nice looking color on their eggs too, which was a pleasant surprise. Wasn't sure what their color was going to look like. Never know what the rooster contributes til it's over and done with.
Anyway, they are laying and have been, yet, out of eight others not with a rooster only one black is laying. Two of those eight are wheaten/ blue wheaten and related to the others currently laying. None have any additional lighting either. So, its a bit strange. You would think maybe its the line is just better and starts earlier, but two related but not with the rooster haven't started. So, it's a bit of a head scratcher.