One of the first things you need to do when painting a person holding a black and silver bottle is to get the proportions right. If the person is too small or the bottle is too big, it will look unrealistic. Once you have the proportions right, you need to start painting the black and silver bottle. It's important to start with the black paint first, because if you start with the silver paint, it will be harder to get the black paint to look right.
Once you have the black paint down, you can start adding the silver paint. Start with a light silver color and then add darker colors until you get the desired effect. You may also want to add some highlights to the silver paint to make it look more realistic.
Once you have the black and silver paint down, you can start painting the person. Start with the skin tone and then add the other colors. It's important to paint the person in a realistic way, because if they look too cartoony, it will take away from the realism of the painting.
One last thing to keep in mind when painting a person holding a black and silver bottle is the lighting. If you paint the person in a dark room, it will be harder to see the black and silver paint. So, try to paint the person in a well-lit room.
following these tips, you should be able to paint a realistic looking person holding a black and silver bottle.