What is the difference between the images formed by a large and a small mirror?
The images are equal.
The only difference is what we have to do to view it completely. If the mirror is large enough, we can see the entire image from one position. If the mirror becomes smaller, rays from some parts of the object (or image, no difference) will not enter the eye. But we can change our position and view any part of the image.
If a mirror was concave, the answer remains the same.
Please look at the picture. The object, its image, large and small mirrors are shown. An eye and the paths of rays (beams) are also shown.