What's wrong with my illustration?

[Artem]

Hey, guys, I'm looking for critiques for my image. I see that something wrong with this illustration, but I don't see what exactly. I wanted to keep this image realistic, but I don't know how.

It would be fantastic if someone could help me.

[Mike086]

Yo I did a paintover and photobash example for you on my stream, watch that here: https://www.twitch.tv/videos/153828544