If you're hoping to make your white and brown hamster painting look realistic, there are a few things you can do to improve your chances. First, take a look at photos of hamsters online or in magazines to get a sense of their coloring. You may also want to ask a friend or family member who owns a hamster to let you take a look at their pet up close.
Once you have a good idea of the colors you need to use, it's time to start painting. Begin by painting the entire body of your hamster white. Once the white paint is dry, start adding in the brown fur. It's best to use a light brown color for the majority of the fur, with a darker brown shade for the tips of the fur.
When you're happy with the overall look of your painting, take a step back and examine it from a distance. If it looks too flat or two-dimensional, you can add some shadows using a dark brown or black paint. And finally, don't forget to add a few highlights using a white or light brown paint. These small details can make a big difference in the overall realism of your painting.