Oh man, I love a lot of things about this!
Feels like you really looked at my little character reference thingie and took into consideration I like doing archy poses having characters with their backs curved.
I love, really really love, the cold colors you used and how the body is kinda muscular but still skinny. The pose seems like something hard to achieve with such dynamism while also having a super clean and nice linework(I´m curious to know if there were many other pose sketches, or if you got reaaaallly good actiony references and got it in few takes, great job anyways).
Also, I love the setting, a crazy suicidal sled jump. Awesome work, happy holidays