Yup...Kimmy's hearts 3 is normal size..whereas the other three are very low resolution...very small..thus pixelated..
I couldn't correct the problem on my end for her..hopefully she made them and saved them on Max and can redo for higher resolution of around 300 dpi at 2x2 inches.. That will make crisper like the number 3..

Thanks Letha for letting her know! Wish I could just fix em for her! but can't..too low..