I have silver laced Wyandottes that are 15 weeks old. I have three that have developed a redness to their combs & wattles. They do vary in their patterns but not consistant to their combs. We have not had anyone crowing. I am pretty sure that those 3 are roosters but to me, they LOOK like hens (in body shape & even feathers). It's just the red that is telling me that they are roo.
I'd love to say that yours looks like a pullet, but I'm leaning towards roo. Just the way yours is standing says roo to me.
GOod luck.