For some images you might try downloading the demo of "Conquestof Elyssium II" which is Illwinters game before Dominions. I was surpised to see that there were a number of images in there which were not used in Dominions.
It includes some little goblins, trolls, dark elves. Many things which should fit in nicely with Dom2
Also you might visit the great site of David Gervais. I havent been able to get him interested in Dom yet (too bad, he has done some great things for other Shrapnel games) but he did say we could feel free to use his tile-sets.
http://pousse.rapiere.free.fr/tome/index.htm
For comparable stats and abilities you might ask any DnD person if you can look at their books. I believe that Dark Elves and Goblins are listed but Alfheim and Svartalfheim are also. Usually the numbers and abilities and descriptions reflect a fair amount of research already done. Not GREAT research, but some.