a new type of packman?

[Gors]

No teacher would say that to someone.

Lies, I've had some pretty bad teachers my friend.

whoa, that's messed up... I feel sorry for you...

on-topic, you're certainly improving... that's good

But try to keep its outline smoother. Also, his cheek shading doesn't work anymore, so try playing with it a bit.

Again, don't use line tool. It makes your sprite look bad. try making it more life-like. A bacteria isn't totally straight, you know.
His chin looks bigger in the second sprite. Make it smaller. Your chin doesn't grow when you open your mouth Also, keep his details constant (your first sprite has 5 teeth showing, but your second sprite has 4. Did it lose its teeth when eating?)