Frank Shepard Fairey is a graffiti artist who had his work showcased in both museums and on the streets. I think his artwork is very realistic and somewhat inspirational because they mostly feature a person with a message on it. His work reminds me of advertisements that tries to sway people to think his way. It seems like he is very fond with using red and black, perhaps because those 2 colors are very bold and he would like his work to be seen.
Here are a few examples of his work:
