You could have used the colours already in the picture for the AA instead of making more (apologies if you did, I'm only judging by eye), but the lines on both legs looking much smoother! The added shadows to be darker legs also improve the look and give it more depth, I think. 
Please keep in mind I am not an AA expert so please don't take my example as "correct AA" Check out some of the much more skilled people on this forum and try and copy their AA technique.
I'm not sure why your preview animation isn't working. Does the upload file animation gif play OK when it's on your computer?
And i have one question: why i don't see animation on the preview image?
Thank you for help and very big thanks for picture.
I added AA and some color changes.
I think you should try some AA on this; it would improve the appearance quite a bit. Also, maybe tone down the dithering a bit. Here's an example of what the front leg might look like with a bit of AA and less dithering. Sorry it's a bit sloppy I was rushing but I think you get the idea.
Thanks!
About preview animation: i forgot press ''Animation Loop'' when saved the GIF and animation was played only once.