I don't know how I missed those up until now. Good work. And the centaurs, especially the champion - top notch! And another advice about bases that I think works is to make some height differences, some small hills and whatnot - you have space for that and makes thing much more interesting - if the model allows for it of course
Nagash doesn't like hills on his base for example
They're easily made with milliput or even plasticine if you're determined 