愛してる obviously emulates a similar style to Robert Indiana's LOVE. Because of the nature of the Japanese language, there are many more curves involved, which detracts from LOVE's simplicity and clear-cut lines.

Especially since the 愛 character has significantly more detail, your eye is drawn to it, but that is the character that symbolizes "love" in Japanese, so it is alright, although the image is less unified.

But because of that, I think there's not enough definition in the negative spaces. Despite efforts trying to increase the amount of green, there is no "large patch" of it, and instead many cut up bits and pieces of it which is slightly unappealing. However, even if I were to increase the amount of space by making the character thinner, then the character would be even thinner than it already is and would be similarly unappealing.