Unfortunately, commercial coops are notorious for overestimating chicken capacity. Mine is rated for 8 chickens, but is slightly crowded for my 3! The usual numbers quoted are 4sqft/full sized chicken in the coop and 10sqft/bird in the run.
Security-wise, I think you are fine. Do have some other thoughts:
Your chickens do have a little shade in the coop area, but you might want to tie a tarp over part of the top or use something else for shade during the summer particularly.
I couldn't see the coop area proper very well, but I...