How can I look more feminine? Is it because my face is fuller? I am a woman but I've always thought I looked masculine (Photo)

I don't know if this is what you mean by appearing "masculine," but you may consider that your nose tip could be reduced with a rhinoplasty procedure, and depending on what you think of your chin and your forehead, there are procedures that can reduce the prominence of these areas as well. This link below is for facial feminization, which is usually discussed in the transitioning community, but some of these concepts are not specific to transgendered individuals.