1/2 focus -- focus is on the corner of the mousetrap, but is clear
2/3 composition (inc. background) Would have liked to have seen more tail on the mouse, and you can see the thread holding the cheese;, otherwise excellent
1/3 color/lighting -- I like the glow from beneath, but unfortunately it places the mouse in heavy shadow. The monochrome look of the picture is suitable and appealing.
2/2 artistry/emotive/WOW factor -- This is cute and it made me smile.
A cute model but a better name would have been mice. Rats is rather a too aggressive term for such a sweet image. The composition is good but overall good focus is wanting. There are some images whereby we are limited to perfect a capture. So the image has merit on composition and lovely model. Bumping up one notch.