For Jem'Hadar, I have to say I always think of ones like Talak'talon (minus the eye-brow ridges), Ometi'klan, Remata'klan, Goron'agar etc., before they started (around the time of
the Siege of ARR-558?) gluing those weird white spiky things to their noses, and later their lips...

What use could those possibly serve? It looked silly to me... the only place it worked for me at all was (about 39 minutes into
Til Death do us Part) the Pilot on Weyoun's ship, I think he was the only one with brown hair... and even that was pushing it...