Use a tape measure to measure both the back of the tires, and the front of the tires.
(measure at half of the height)
the tires should be slightly closer together in the front,, typically 1/8 to 1/4"
Remove a tie rod, and twist to adjust,, only one side needs done, unless there is a severe adjustment needed,,,
Check your owners/service manual to determine the amount of "toe-in" that is required.
If the front tires are "toed-out",, then the tractor will wander when attempting to drive straight.
Also, toe-out will cause tire wear if you drive a lot on paved roads,,
Oh, yea,, camera pics,, and "your eye" are a terrible way to determine toe-in,,
you are wrong 97% of the time,,,