well for starters i think you got the gnome race all wrong, they shouldnt be like elves what so ever. They should be tinkers 'Should not be just tinkers' would take the fun outa the gnomes. Geneticaly tiny yet massive ideas and constructions.
But i only think other races that should be added are dwarves and maybe undead just because they have their own style set them appart from other races such as the undead being all dark and misurable. Yet dwarves proud and a honorable race. In a fantasy i dont want 'Which race shall i be a ranger elf type forest lord or a gnome ranger trype forest lord?'