Age would help, and full body standing. I'd like to see feet and wing tips in proportion to body.
And yes, that looks like a rooster to me unless it is 16 to 18 weeks of age, which I pretty sure it isn't. (I also think I see some reddening on wing bows).
I got this one from Tractor Supply. He is about 9 to 10 weeks now I think. He is as big as my leghorns who are about a week older. I had asked for 6 pullets ( 3 leg horns and 3 isa browns). While the lady was collecting them I went and got chick food and came back to a closed box so i collected the box, paid for my chicks and the food and headed home... when I got home and opened the box there was an extra black chick in there.
ok, thanks. He is a pretty and very friendly bird, often getting on my shoulder or my back any time I stoop over in the chicken run, altho I am not really sure I should keep him since I really just wanted to have egg layers.