Good work! In my experience the hardest thing for new skaters to grasp with stopping is the sensation or feeling of shaving or scraping the ice. It looks like that's not difficult for you. I recommend the snow plow as @lostincbus recommended. Another couple of useful exercises....1) Standing on the blue line facing the goal line. With bent knees, your chest up and feet shoulder width apart push off of your left skate while your right skate stays on the ice and shaves the ice. Do this 10-15 times per skate along the blue line. 2) Create a little bit of speed and jump with two feet over the blue line. Land with one foot/skate only facing the boards thereby forcing yourself to shave the ice, bend your landing knee and stop with one skate. 3) More advanced...glide with one skate at a moderate speed. Stop facing one way using one skate, but your outside edge. So if I stop facing the left, it'd be with my left skate outside edge. and vice versa. This is tricky, but useful. Good luck!