Here’s a quick Admiral Ackbar that I did at 64×64.
This one was a little more interesting to work on. I started out at 16×16, as I always do, and found that there weren’t a lot of details that I could put on him at that resolution. At 32×32, I was able to shift the eyes, which gave me enough room to add the mouth. When I went to 64×64, I realized that the white space suit he wears needed to be given a little bit of color to allow it to stand out against a light background. I also added some spines to the arms, and irises to the eyes, and nostrils, to give a little more detail.