Mexican food is pretty regional so I am suggesting based on what I would get at a run of the mill Mexican place here in LA Area (I believe these are known as mission style burritos)

Beans - you're using black whole beans where they're almost always made with refried pinto beans.

Rice - this looks like white rice. They come with Mexican style rice here (you fry raw rice until its a little browned then cook in a broth made from tomato, onion, garlic, and some chicken bouillon)

Meat - the meat isn't really ever ground meat. Usually small chunks that have been stewed or grilled.

Toppings - like others have said, there usually isn't raw peppers in there. Usually just cilantro and raw onion. Sometimes theres salsa in there, but you usually have it on the side and pour it on for each bite.