What I had in mind for the beastmen were basically the Shifter race from DnD. Basically humanoids that take on characteristics of beasts. They could be normal things like wolves, cats, bears, birds ext or something more exotic if you would like. I'll try to find and like a free source that gives a little more detail to the shifter race but in the meantime yeah they can be something more monstrous.

[@Fetzen]

[Url=http://dnd5e.wikidot.com/shifter]some info on shifters[/url]