My engine was burning oil, so I pulled the head and this what the pistons look like.

 

From a high level / single picture - nothing looks wrong to me. But you wouldn't know the full story without pulling them out of the block. Have you determined where the oil was coming from? Bad valve stem seals / worn guides? Or do you suspect rings?

 

The headgasket has some signs of damage and I suspect the valve seals to be replaced also.

 

Pistons are cleaned at the outer edge what may be caused by the oil that was passing through rings.

 

that is some dark green coolant you have there.

 

Mileage?
The bores will give you a better picture of what is happening without piston removal.

 

Take the pistons out and mic them according to the service manual. Everything else is just guessing.

Leakdown test can also give you a good idea of where the problem lies but you'll need to put the head back on to do that.

 

He was running kool-aid

So there's two ways an engine can burn oil. Stem seals or rings. You can clearly see the burnt oil on the pistons. If you take the piston out you can inspect the oil control rings and I bet they're clogged up. The second ring is also an oil scraper. Behind the oil control rings are little holes. These are oil return paths and they can get clogged. Newer toyota's are burning oil due to low tension rings. Maybe your rings are losing tension with age. Auto's tend to get stuck oil rings because they don't decelerate in gear like a manual which sucks the rings out keeping them clean. Also now you have the head off you change the stem seals. Stems seals will burn on startup and decel I believe. Oil rings all the time.