We don't have a lot of Teal, but lots of Gadwall & Wigeon. Pintails and Mallards react similarly. It's hard to describe without a picture but here goes.
Not sure if you're on open water, from shore, etc. but in principal they're the same. Always set decoys with the wind in mind. Ducks will hang on the leeward side of an obstruction to stay out of the wind. Place decoys so they appear to be relaxed and milling around. If they're to close together they look like they're alarmed and bunching before flight. If you put a few in close to show there's no danger in your blind then scatter a few, leave an open area in front of you about 12-15 yards out. String some beyond the "target" open spot on either side, with more on the most sheltered side of the obstruction. It will look somewhat like a deep J. Your blind is the obstruction whether it's a sink boat, pit, or just brush. Make sure there isn't anything flashy ruining the view. You can get a roll of camo bow tape to help out if the bluing and stock are flashy. It can be taken off after season with no bad side effects. Movement is a bad thing when they're coming around too. Keep the retriever still, don't move anything you don't have to, and don't turn your face up if your one of the white boys. I'm Swede so have the blond hair pale face that reflects sunlight like crazy. I use a face veil for hunting a lot but don't take duck hunting as serious. I just keep my face out of the sun, look down while they're close and use camo cotton gloves with the fingers cut out to work the call.
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