Ok folks, this is my first tutorial ever that will show you step by step on how to color anime eyes using Paint Tool Sai, a great program for digital painting. I will be guiding you through my every day process on a quick painting of a simple anime eye. You will first need to download the program 'Paint Tool Sai', which is available for 53$ at their website, but they also offer a 30 day trial. Once you've got your program installed and ready, time to open up an already inked project in Sai.