you should always be shooting on manual with a dslr. your shots will turn out way better and more consistent if you are just aware of your lighting situation and control your iso/shutter speed/aperture respectively (which can seem like a lot of work on the go but once you get used to it you wont even think of it and your shots will look awesome). You dont really have to worry about the lighting changing half way through a shot, it wont be that drastic when skiing and its better to run with a consistent setting than to have the lighting changing throughout your clip randomly. One last thing was the black flashes, they where a meh for me.
Overall i liked it and i think you did a pretty good job. If you shoot on manual however you will be able to achieve more natural contrast in your shots and be able to control exactly how bright they are.
Hope that helps a bit.
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