What are the essentials to make your atv better in the bush, woods, desert or where ever you hunt?
I plan on a winch, getting tank bag, have a GPS..

 

A few things immediately come to mind. Brush guards for the handlebars for wind and brush protection, Heaters for the handlebar grips and a rear view mirror.

If I could only have one of the above it would have to be the rear view mirror for group riding or the heaters for wilderness survival.

Don't forget the military shovel to use as a ground anchor when there are no trees around for the winch.

The tools necessary to drain the carb in the event of a drown-out. A spare spark plug.

Tow strap, small light to mount on visor or cap, 2 cans of "fix a flat", tire plug repair kit, bandana for dust, eye protection, and windproof riding gear, swampers and pair of dry socks. A small damp rag in a freezer bag is also handy for dusty conditions.

"It's a 106 miles to Chicago. Got a full tank of gas, half a pack of cigarettes, it's dark and we're wearing sunglasses." Hit it!

 

I highly recommend a Koplin Gun Boot.

 

Rack extensions should be one of your first accessories. I love mine; you can throw everything on it and take off: Big game, stands, feed bags and feeders. Just all kinds of stuff. I also mounted a gunrack, like the kind that goes between the handlebars, on my front rack. Everything is out of the way up there. The gun sits in the rack with the butt protruding over the handlebars just a little, not in your face.
You can also hang things like a backpack or a 5 gallon bucket from it.

All the tank bags and other bags you can find plus some of those handlebar mittens, they are good for cold and briars.

My next purchase will be some Vampire tires to go along with the winch I just put on there.

Since you own a Polaris, did you get the optional big front bumper? I really think those are a good idea. I've had to push my way into the woods on my Prairie resulting in some of my front composite rack to chip. They aren't protected very well, but are better than the steel ones for hauling stuff.

A GPS could come in handy, it don't take long to get misplaced when you are having fun. Been there and done that.

Oh yeah, I always carry some tires plugs and some fix-a-flat just in case. I have used several of the plugs over the years so you can't go wrong there.