I don't really like the fact that there are so many demons on the Lizard – it creates some confusion, as Warlocks ride Lizards – in general, riding a Lizard in Inferno is a privilege of Agrail, and only because he is not really a demon, but a dark elf (Rylag). It is permissible to make one or two heroes like that, but not all of them (well, this is just my IMHO, in general, as I wrote earlier – it turned out pretty well)

Added 2 minutes later
Of the Dark Elves, from the models I haven't seen, I only liked Ramelia and Ilmirn (but he needs to change colors)
The Overlord is good, but maybe we should stop feeding him with plants! – how about the idea of making him based on the Incubus from NCF – we discussed it the other day