Google Images has now gained its own Search Options. You’ll find the full story on the Google Blog.
This new feature offers quick access to existing tools, including search by color and image type. Color search will find images that are only in color or only in black and white, or even images that contain a specific color, such as red, pink, or green. Type search is a great way to narrow down your results if you are looking for a specific kind of image, such as a photo, clip art, line drawing or face.