When Evokers cast a spell in their Visage form (e.g. Living Flame), they don’t have a proper caster stance animation like the other classes. Instead, they use some kind of default unarmed melee stance which doesn’t look good.
They should probably use the same stance as mages or warlocks (it’s consistent with the Dracthyr form animations), or even no stance at all (like monks).
Image example: imgur.com/JL9qPRR