I am not quite sure what my personality type is, I haven't taken any sort of test - however, I am quite introverted and tend to avoid social interaction whenever possible. I think this shows in my art, at least currently, with my preferred subjects being plants and animals as my life is primarily focused on being surrounded by other people. I don't have a lot of time to physically enjoy the experience of nature, so drawing things that I wish I could spend more time experiencing is a good compromise, I think.
Also, it helps that I am very detail oriented, and plants and animals have so much detail to them when we look closer. We are so used to looking at other people all day, especially if we work closely with them, that we don't take time to consider the other things surrounding us that hold so many small pieces of beauty that capture our interest.
Perhaps in a way it's an outward expression of my desire to replace my very urbanised, corporate existence with one that is more slow paced and naturalistic like how we used to live in the past (My love for archaeology and anthropology slipping through there!)