You can google for the pic, of if it is in a book, scan or even just photo it.
The problem with these random pictures is that they are sometimes too shady, dark, etc- I use IrfanView64, a free program and you can make these adjustments easily. You have to play a little with it sometimes.
If you have a picture, you are 95% there. Just open it in MS Paint (If you can not because of the file size/type, make a screenshot, easiest to do it with Win+Shift+S combination), resize it and print. I never print directly from a picture, I always add it to a Word document first- easier to adjust size.
If you want to paint it with your hands, you do not have to do it in microscopical size. Paint whatever size is the best for painting, then scan/photo etc it, from then see above.