Effigy's are hard to find. To make one take a foam hen turkey, cut a slit for wings, stick the wings or large turkey feathers in like you have seen dead birds and secure them with solar seal or something then paint them black feathers and all. For the turkey vulture I would either leave the head the way it is or paint it red.
Those motion detector scare crows if the are landing somewhere. Use a high quality hose to resist freezing, boiling from the sun or just high water pressure. If the water pressure is high you may have to add a reducer.
Get a permit to kill a few of them you probably will only need to kill one or two. Then use the dead vulture as an effigy. The permit allows you to do that and it is great if you are in an environment where you can use it.
If they are landing on and or damaging a roof shock trac where they or landing or an electric fence. Like all animals they hate electricity and have no education to help them defeat it so they pick another place to hang out.
The lasers work very well on roosts but to be the most effective someone needs to be on site. So you may have to rent or sell a laser to your customer. For that to work out for you you need to be paid for a management plan.
Sleep'n with an animal..I can help.
Do not use both feet when testing the depth or temperature of the water