Nice, Smashed Pumpkin! makes me want to get in an animate Out of curiosity, what's your workflow like in Maya? do you end up setting keys on every frame? or do you use the curves? Do you started with stepped curves, or work directly in splines?
As for the animation itself: The hand tapping is nicely done, as well as the racked focus. The treatment on the lights from the rear of the monitor is nice too. My only critique on that clip is that the camera stop is rather abrupt, and might have benefited from an ease in. (I'm using the past tense because I am assuming you will not be going back and re-working these, since they are rendered and all.)
The second clip:
What you've done here is nice, and it shows you've thought about the animation and spent some time on it. The idea of the pose the character is in is a good one - leaned back, trying to 'score' a basket with wadded up paper - and you even 'set dressed' the table with a few misses. I think the silhouette could be stronger, however. All of your movement/action is in the right hand - which is hidden within the silhouette of the body itself. The hand also passes over the most detailed area of the human body - the face.
Didn't notice this right away but it's a nice touch: the pens are animated when the paper hits them.
I find I'm also confused by the expression change at the end?