I think this image close up works well because you can see the heart on her nail. I think the natural lighting and pose works with the nature aspect of it all, but I don't know how it would fit with the rest of the images.
These 4 images work really well as a set. Mainly because I have used the same leaves image to blend into the 4 individual images, but I don't know if they are to similar although they do work together because they tell a story.