Copy the “before” picture into your Photofiltre program.
Using the selection tool on this setting:
Zoom in and make a selection around one eye. It doesn’t have to be perfect.
Then click (It’s one of the selection settings)
That should make your selection look more rounded.
Click and change the color to whatever you want.
After colorizing one eye drag the selection over to the other eye and colorize that as well. Note: When dragging the selection over it may not always fit the size of the other eye so you may have to make another selection.