Lots of people dont do feet but I like to add them.
Sometimes I just sculpt them on the leg but its a little easier to make each foot individually
Take a small strip of fleece and roll it fairly tightly into a ball
Carefully holding between finger and thumb felt all round to secure and begin to firm the ball
As you work one side looks a little flatter so flatten this out more by stabbing all along. Remember the fleece matts in in the direction of the needle so always stab in 90 degrees to where you want the surface to be (in this foto the needle is at the wrong angle - not easy to hold, stab and photograph)
They might not all be the exact same size. You could add more fleece to even them out. In this case I just used the two smallest for the front and the two biggest for the back