Check that all mirrors are in place and not:

damaged or missing glass
covered up
insecure

Check that the windscreen is not:

cracked
scratched
discoloured

Check that the windscreen and front side windows are not excessively tinted.

Check that no objects get in the way of your front view.

As a general rule, there should be nothing in the swept area of the windscreen wipers.

As long as they do not seriously block your view of the road, you can have some official stickers and road safety items, such as an operator licence disc.

If you use a camera system instead of a mirror, check that it works and the view is correct.