Can you use a photo to create a seriously tiny black-and-white picture? There are times when an icon, logo, phone graphic or thumbnail can only have two colours.
The short answer to that is not very easily
JPEG 72 x 28 pixels
2 colours no dither
2 colours 100% dither diffusion
2 colours 100% dither noise
A photo with only two colours will often disintegrate at tiny size
You see what happens to a photo when reduced to an inch wide, and then on down to only two colours. There are not even any shades of grey. Dither (various patterns of dots) helps to model the main shapes. Photoshop offers three varieties of dither: Diffusion, Pattern and Noise.
However, most of the detail is gone.
If you don't feel you can tackle a design a whole inch wide - you can always stick to extra small drawings like this sunflower.
You could clip a small area from a larger picture. Preferably your own artwork.
Be sure to observe copyright if you are chopping chunks off somebody else's work. Even more so than photos, drawings are very much the property of the person who created them.