Stylistic, those are very nice indeed.
How did you make them? You can see my avatar, it didn't turn out all that great. First of all I had to remove the color and remove some frames to keep it small. But the main problem I faced was in capturing frames. Since I did not have any software that did it, I had to do screen capture. But with that there is a lot of error and consecutive frames differ by a substantial number of pixels. This too added to the size.

If you can make a < 50KB color/ BW animated avatar of Pentangeli from the final scene with Tom when he says "Corleone family was like Roman Empire", that would be great. But don't bother if it is going to take a lot of effort.
Thanks,
Svsg