I agree that you can roll the dice on a retake, but schools will often average MCAT scores for screening applications. With two MCAT scores on the books, you need to push +10 above your higher score (meaning 519). Most of us expect +3 as the best one can do as a reapplicant, especially once you hit the 510s (because of the way scaled scores and percentiles are related here); it's easier to gain 3 in the 500's, so good for you for +5.
What comes through with your description is your interest in serving others through your artistic interest/photography. How should this insight inform us about your vision as a future physician? Why should your classmates look up to you? Do you have an answer?