The R22 is fine if you and your photographer aren't too heavy. When it comes to high hovers you just need to be careful, with power limits and wind direction. Most days, out of ground effect hovering with a tail wind just isn't possible in the R22, depending on the OAT.
Most photographers I fly with don't want anything too ridicules when it comes to altitudes. For the most part they're happy with a 40-50kt orbit. But the kind of shots they need is what will ultimately determine what they ask for. If you do a good preflight briefing on what they need beforehand, with satellite shots of the site, you should be able to determine if you can give them the angle they want. If a guy is asking for 200-300AGL hover you better make sure he is on the side of the helicopter that will put you facing into the wind with a big sexy open field beneath you while he takes his shots! Keep in mind that the controls aren't removable on the right side of the R22 , so if he needs to be on that side, it could be a problem.
When operating doors off, make sure everything in the cockpit, including the stuff in the occupants pockets is secure. Phones and coins have a habit of falling out of pockets while sitting, and the last thing you need is one of them stuck in your tail rotor! It's best to have the camera tethered also.
Make sure you do a proper recon of the area you'll be flying around, especially when operating below 500AGL. The photographer may not want to waste time and money flying around in circles for a few minutes before you descend but explain that is all part of what needs to be done to keep him from getting dead. Also don't forget about other air traffic while focusing on your recon.
Most photographers want the R22 for the obvious cost reasons. But sometimes when you explain that they may get better shots from a more stable platform they'll fork out the extra dosh.
Don't forget to give the photographer the passenger briefing and all that good safety stuff, especially when they're not used to shooting from a helicopter.
Also, the altitudes you operate at for a given ship(single engine, or multi) may depend on the regulations. In the US, people generally don't mind where you operate, as long as you don't squish anyone on the ground in the event of a problem. If it's legal, you should maybe as a courtesy contact the local police and let them know what you'll be doing. That way, when the crazies call complaining, they can shut them up fairly lively!! This may or may not make your life a lot easier depending on the area and the views of the local police department on helicopters flying over their area.