Keep these things in mind when showing property:
Leave the property as you found it, making sure doors and windows are secured and lights are in the same state they were in when you arrived.
Consider providing feedback as well after your showing.
Leave a business card.
Utilize a showing checklist which ensures you don't miss a step when starting or completing a showing.
A well executed showing leaves a great impression on your buyer, the seller, and the listing agent. Keeping these tips in mind will help ensure you achieve that great showing!