My first sprite...

[FillerSprites]

Better! The thing I notice immediately, though, is that the back is too straight. I'd recommend rounding it more right by the neck area. You have a strange mix between sitting and standing, so I'd either pull the front lefts closer in or jut the butt area up a little more to get a pounce-like pose.

I see. The jagged line should be an easy fix. By front lifts, you mean legs? No problems, We all make mistakes.

[AkumaTh]

It is definitely an improvement of the original in terms of line art. Good luck with the rest of it.

[SmithyGCN]

The eyes don't need to be so big, though. You could stand to make them smaller. Many sprites don't even outline the whole eye. You could do well to adjust them. Study game sprites to get an idea as to how an eye is properly made.