It certainly doesn't look too crowded. It probably just needs more time. In fact once you get dialed in it is easy to tell when an ear is ready by how plump the ear feels.

Thanks. I was just concerned because the silk is dried up and brown on several of them but they are still very skimpy. I guess they'll continue to grow?

Silk does not look that dry. Some varieties have long slim ears. If the kernals fill out , no problem.

They'll fill out more. When the ear feels plump test the biggest by checking the kernel color and size.