This is almost the only entry where the large image feels like an upscale of the small image with a few details changed. Your two sizes have distinct differences.

I would have thought with all that dithering you could have done it in less than 19 colours.

Nice one!

It doesn't matter if they have different stances or even graphical styles, as long as they both read as the same rat but at two different sizes.

I thought that they could be in different postures, (I find it more interesting that way). But if it is not possible I can change it.

I thought that the sprites should be basically the same. The mice are ok, but they are quite different ones