Aquarium Photos. C&C please

[e._e]

These are pictures I took at an aquarium on vacation. I'm pretty sure my camera isn't advanced enough to have any of the settings and things I've read on this forum so far, so I guess I mostly need criticism about the.. composition?

 

[syphlix]

they just look kinda like snapshots to me

 

[512]

composition:
#1 you cut the tentacles!
#2 you cut a fish!
#3 you got a shark!

i was joking with the #2 and #3, 'cause i don't have enough infos about the situation to say something. acquarium photos are quite hard to shot because of the light and the glass. you need something more than a point and shoot camera and a tripod is necessary.