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The 3 person mage icon could be a simulacrum type of spell or a blink or maybe a teleport. Mage spells can be hard. I see a rain of arrows type of skill/spell too under the ranger and a pin down snare or root. Guild Wars pin down skill has a very similar icon. I always liked that one.
The doppelgangers should have health so an enemy attacking it wouldn't dispel it right away. How much health and how it works could depend on factors like the mages level, intelligence, and such.
And hopefully race will affect some skills. I'd love to see racial variants, although that can end up a balance nightmare and lead to other problems.