This reply is for Tactical Teacher's picture.
You're pretty exposed with your chair and gun up that high.
I always sit on the ground with my back to a tree when calling. I also try to sit back from the tree-line in the shade if possible.
You might want a snow camo pop-up blind to hide your stuff in if that's what you want/like to use. Or, if that is a place you are going to regularly set up at, screw a white sheet of plywood to that tree for the season and sit behind it.
Looks like you're dragging everything in on the sleigh and a blind won't add much to the load. Will cut the wind down too. I'd drag the sleigh back out of sight or hide it behind the blind too. If you are hunting the same spots all the time I'd drag a white sheet of plywood into all of them and leave them set up for the winter.
In my experience, the better you get to getting to the set and setting up quietly, the better the success rate is.