Did you sand or chemically degloss and prime the frame before painting? If not, then the gold paint you have on there won't be adhering too strongly. You can wipe the frame with some mineral spirits or paint thinner and see what comes off. Then you'll need to start over. Sand the frame. Prime the frame. You can use the same gold that you already have and then glaze on top of it with an oil based glaze in a brownish tone. That will greatly tone down the gold and give it that "antique" tone. How much of the glaze you wipe off will determine how bright the gold is that's exposed..

I don't know if this is practical, but I found at a paint store, some 'sign' paint for painting gold letters. It was available in antique gold, roman gold, bright gold, etc. You might try this type of idea. I don't know if it will take the heat though.

Prep is key in your paint holding up over time. Some brass hardware is not even brass. Just a coating baked on and a shiny protective spray to keep it pretty. : ) Even good solid brass hardware has a coating. Proper prep means a good cleaning with soap and water and a fine steel wool to give a microscopic tooth for your finish to adhere and bond. I usually wipe that clean with mineral spirits just to be sure. A good primer, an etching primer is best on metals. Should come in a dark color as you want a bronze dark finish? Also paying attention to temperature and allowing the proper time for the primer to cure. Usually the can has a window of time where it is cured and the final finish coat should be applied. Non of this should be done without proper ventilation and a respirator. NO family members anywhere near this process especially children. Best to set up outside on a tarped table in a garage on a calm day, no wind. Low wind, set up with the wind behind you. My entry hardware is brass, but good solid quality. I took the hardware off, switchplates, etc and took off the coating, cleaned well, and gave an overall burnish with fine steel wool and a red scotchbrite in small circular motions over and over a few times. They now have a nice matt finish and a soft patina and a light tarnish. Not fake shiny anymore. Did the same with the stainless plates in the kitchen so they would match the brushed stainless appliances. That is alot of hardware. Might just want to start with the most offensive areas that really bug you. The entry foyer, kitchen, main living area first. Or in small batches if you don't want to remove the hardware. (i would remove it) spraypaint mist tends to travel airborn and ends up on floors and furniture without notice until too late. Here is a link that might be useful: painting brass

Missy, I don't really have anything to add to the techniques listed above--all good advice. What I did want to mention is that I recently spray painted a brass bed and I used a mixture of Rustoleum Metallic Copper and Metallic Oil Rubbed Bronze and love the way it turned out. I also like Krylon ORB but it really looks black rather than bronzy. The flat black as mentioned by Porkandham above always looks good, too. Looks sort of like iron (imo) when finished. Good luck with your project.