I've bought ISA Brown day-old pullets and cockerels direct from Hoover hatchery. Hens look the same as Golden Comets, and my ISA Brown roosters look exactly like your Comet rooster. From the cross, most of the offspring (both male and female) will resemble the coloring of your Comet hens, but with a little more white feathers mixed with the red. Some of the cockerels will be colored like your rooster, mostly white with red on the wings. I also got some solid white pullets from this cross, and a few solid black birds both male and female. Egg color of offspring is generally a lighter brown than the original ISA Browns, but the hens lay well and both male and female offspring have nice gentle temperments. I think you will get similiar results with your cross.