I'm not going to pick a part each drawing (sorry!), but I will give you an overall critique on the art you posted + advice on art...Also, this post is a little bit long...feel free to ask questions, because I might be missing something in my rant (or I didn't finish a thought...!!)
Obviously, your art is really stylized and flat. There's no form in any of the drawings. It's really obvious in the hand sketches. There's no sense of perspective. It also looks like you are afraid of drawing hands and feet.
Since you're starting out - please, please, PLEASE use references!! I cannot stress this enough!! As you keep building up your mental library, you can begin to rely on your imagination to fill in the gaps, but you aren't there yet. You don't have to use references if you're just drawing something simple in your spare time, but for studies (like you're doing here), references are important. There's a ton of references online, even apps on tablets and phones, so there is NO EXCUSE FOR NOT USING REFERENCES!!! [http://fyuvix.deviantart.com/art/Tutorial-Using-Photo-Reference-177367560](Here's a fun guide on using references.)
Moving onto my next point...you're sketches are incredibly stiff. There's no life in any of the drawings. Even when you're standing up straight, you should still be able to detect some sort of weight - even if it's a subtle tilt in the hips, shoulders, head, etc. No one stands up straight like mannequin.
Calarts is looking to see that you can draw. They need to know they you understand form, motion, weight, and anatomy. Carry your sketchbook everywhere - draw people, draw animals (they really like seeing animals!), draw landscapes, and backgrounds.
If you are applying to Cal Arts, it's really important to look up the portfolios of people who applied there. Here's one artist that I like that got accepted into the school. There's also a bunch of threads on the conceptart forums.
Spend a couple of seconds drawing someone, anything - focus on capturing the essence of the pose. Try to notice how their hips or shoulders or tilted, take note of body language...and so on.
And a small point about animation (I can go on about animation forever, so I'll keep it short)...everything that I just mentioned above is extremely important to animation as well. You need to be able to express weight, form, motion, and gesture. Check out Richard Williams's The Animator's Survival Kit. He animated Who Framed Roger Rabbit and The Thief and the Cobbler. He definitely knows a thing or two about animating.
If you need some reading materials on gestures, check out - Force: Dramatic Life Drawing for Animators [http://www.amazon.com/Drawing-Dynamic-Hands-Burne-Hogarth/dp/0823013685](Drawing Dynamic Hands) [http://artists.pixelovely.com/practice-tools/figure-drawing/](And check out this website for gesture drawing (you can select how long you want to draw for)) [https://www.youtube.com/user/onairvideo/videos](And this Youtube channel.)
Books on Anatomy - [http://www.amazon.com/Atlas-Anatomy-Artist-Stephen-Rogers/dp/0195030958](Atlas of Human Anatomy for the Artist) [http://www.amazon.com/gp/product/0823024156/ref=pd_lpo_sbs_dp_ss_3?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=0195030958&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=1Z6SM8J0HDN0KQVQ5ZCR](Classic Human Anatomy)
Books on Character Design - [http://www.amazon.com/Character-Mentor-Example-Expressions-Characters/dp/0240820711](Character Mentor) [http://www.amazon.com/gp/product/0823023494/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687562&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=0240820711&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0DT0M7JAHHQ4QNSXVWSJ](Creating Characters with Personality)
I own all of these books and they are extremely helpful!
I also recommend drawing still lifes. Try to understand how 3D shape work, ESPECIALLY in perspective (spheres, cylinders, cubes, etc). Knowing how shapes work will give you an understanding on how the human body works as well.
Good luck! CalArts is a great school and I've only heard wonderful things about it (and a TON of success stories)! I want to apply there for my MFA in Experimental Animation some day.