Haemodiasma tessellata - head, La Isla Escondida, Colombia
An incredible moss-mimicking katydid with highly complex patterns as you'll see in the closeups. It is both mossy and spiny. Very lengthy antennae and fully developed wings. I'm quite sure of the Haemodiasma genus, as the anatomy of this katydid matches exactly, and the two species are reported to occur in higher elevation forests, this one is at 850m.
The genus has only two known species, where there seems to be only photos of Haemodiasma tessellata online. It looks like a match to me, but it could be the other species, or even an undescribed species, although unlikely.
And check this other spectacular example: