The flesh beards are normally wiggly, but stiffen when they're scared and get really wiggly when angry.  So their flexibility-stiffness varies depending on their current state of mind.  They do also express emotion with mouth like humans do.

The skin Coloration of them can vary, for instance the back may have different coloration from the hide and the face tends to be of a lighter pigmentation.

There's multiple ethnic palettes of them.  I have thought of a few.  There is pale pigmentation, a silvery grey pigmentation, a tan pigmentation, rusty/reddish pigmentation and charcoal pigmentation.

The color of their compound eyes also can vary.  You have pearl white, jet black and smoky grey along with cobalt blue.