Images not cropped properly are messy.
In addition messy cursors cause the gallery to appear less atheistically pleasing.
You have neglected to note where you obtained these images from or to credit the author(s).
Being as the set is designated into the public domain I would assume that the images used to create this set were all found in the public domain. Only the original creator may legally designate a work into the public domain.
Let me know if you take care of these points so I may review the set again.