Your horsestance seems to be too narrow to be practical?. I think a deep horse stance should be about:
-1.5-2x shoulder width across
-Toes point straight forward to almost forward (this will vary in individuals based on the shape of the hip, eg. girls feet tend to point more outward).
-Make sure you keep the whole foot on the ground
(although my CLF Sifu tends do go up sligthly on the outside edge of the foot)
-Open the knees, make sure the knee is almost directly over the ankle. (This is the biggest mistake I see begginners make, their knees collapse inward. Your stance should have a box shape, not a triangle.)
-As you sink down keep a straight line between the nose and the coccyx (tail bone). Don’t tilt your tailbone too much forward or stick you butt out. This axis formed between the nose and the coccyx will tend to tilt forward the lower that you go. This keeps the hip flexor muscles relaxed. But remember to keep the axis in alignment.
-Each style has different “depth” requirement depending on rootedness vs. mobility. So check with your Sifu on this point.
-Relax the neck (imagine your head is being pulled up by a string from the crown, but don’t"push" it up)
-Relax the shoulders (you can put your hands/fists on your hips.)
-Open the chest to harness the natural tonic qualities of the torso, but don’t intentionally stick it out (military style).
-Don’t bounce up and down in your stance. Hold your position. If you feel like you need to stand up, go lower instead.
-I’d say 2 mins in a correct, low strong stance is a good goal for begginners. More advanced students might shoot for 5-10 mins. However, I’ve heard that too much static training can be hard on health, ie you leak “chi”, whatever that means. But I’m sure people would argue with me on that point.
There ya go…everything I know about horse stance.