As a general suggestion, in this kind of work there is no right or wrong way of "doing" the poses. Every body has a different best way of expressing the poses depending on many factors. Try and listen to the desired sensations and actions in the body instead of copying exactly the shapes: with the time you will learn how to adapt each pose to find the right amount of stretching and compressing that you need. For this specific style of Yoga, a good rule of thumb is to try and keep the sensation in a range of 60-80%. You want to feel some effects on your body, but never pain, so if in doubt back off a little and notice where you can achieve a safe and balanced sensation. In general if you can't breathe slowly or you notice your facial muscles are gripping, you are likely pushing too hard.
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