A convex mirror is a diverging mirror. Light rays diverging from an object placed in front of it appear to come from a point behind the mirror after reflection. This means the image formed is always virtual.
Furthermore, the image formed by a convex mirror is always erect (upright). The top of the object appears as the top of the image, and the bottom of the object appears as the bottom of the image.
Finally, the image formed is always diminished (smaller) than the object. This is because the reflected rays diverge, making the image appear smaller.
Therefore, the image formed by a convex mirror is always virtual, erect, and diminished.