I can't even figure out which parts are which.
There's a tall tank-like thing with a dial near the top, there's a "water filtration" thing, there's a box with a sticker that warns of high voltage, and then there's a cylinder shaped plain thing going into the ground.
I'm guessing the latter is the pump?
I'll go back out and look for a pressure switch at the bottom of the tank but I think it was just a plain tank sitting on the ground.
Pressure switches are typically a small rectangular plastic box (black or gray). They will be connected by a very thin metal pipe to the piping and will have wiring entering them. You should run your water and time the length of time that your pump is running (you'll hear a humming while it is running). That info and the size of your water tank would help in diagnosing the problem.
There must be a well company in your area. Ask a neighbor for a reference or go to the local hardware store and ask them.