Is it giving you issues with the chain skipping over it when you put some power into the pedals to accelerate hard?
I don't see a lot of wear. Why don't you compare it to a pic of a brand new set from the manufacturer's website. You need to do that tooth for tooth after finding the same tooth. Different teeth can have different shapes. Some quite pointier than you'd think.
Seems like a good way to tell if it is worn is after you put on a new chain and it skips on the ring or rings. Similarly it's the same way I decide if the cogs on the rear are worn.