I'm not going to sugar coat anything, and I hope you can take the constructive crit well enough.
On the first one, the ears are a bit pronounced, might want to fix that, was well as with the legs being a bit too short for the body.
On the second one the neck is giraffe-esque, being extremely long. You might also want to have the neck a bit straighter, instead of leaning to one side.
As for hamtaro, you might want to work on rounding both sides of the head properly, as that makes it look like he has a tumor on the side of the head.
Other then that, the style is good, just some minor details you need to work on.
Yak basically covered it, and she's right.
So if it really was your 1st try, no worries, just keep at it.