monster creation kit item rejected

hello, i uploaded my first item 3 days ago: monster creation kit, and got rejected today because it isn’t at the quality standard, can someone tell me what are the quality standards. thank you.

Maybe better to upload some screenshots?

thank you for your reply.

The body shapes are decent, but you don’t really offer many customization options besides mouths, but even they all look very similar, unless there’s more items that you haven’t shown?

The eyes all look the same aside from colour and pupil location.

The overall art style looks a bit outdated.

The preview images here aren’t very interesting with the flat grey background, there’s no life or excitement to it.

thank you for your reply.