Why doesn’t anyone like my art?

My dream is to become a professional artist, maybe do concept art for movies, but whenever I show someone my art they usually don’t care or point out the flaws. I’m not saying I’m a great artist or have any real talent but some things I work so hard on and am really proud of, people don’t really like.

For example, this is something I did last night. I sent it to one of my friends who likes the movie it’s from and showed it to my family but they just brushed it off and changed the subject. I don’t need attention or approval, I just need someone to tell me what it is I’m doing wrong. I mean I’m only 14. I still have room for improvement before turning it into a career but I’m just getting so frustrated.