I like Coulson and Ming-Na, the three people in the left are weird, I see an Eliza Dushku/Dichen Lachman hybrid, Selma Blair/Jennifer Garner and the agent who wears jeans which means he will be the dorky tech guy. All three of them are a little bit too pretty for my tastes, that's not how I imagine agents of Shield, not that they can't be good looking, but they look like they're fresh out of model school. The guy on the right looks fine, he's also very good looking but at least older than 22.
I really hope they add Cobie Smulders as Maria Hill as soon as HIMYM is over, she doesn't have to be a regular but I want her as a recurring character. I'm not sure I'd want Samuel L. jackson to show up, maybe a cameo in the pilot and season finale but if this is a show about the small guys the big boss should be out of sight most of the time.