You are a talented 3D-Artist, no doubt. But for a demo-reel you show us just a little of your variability. I would recommend to add more different art styles, not only 3D.
However, if you want to apply to an job were they "only" want to see a pitch of your 3D art, you should include at least 4 different scenes. The last 2 companies I did freelance work for (as author and translator, I don't have your talent) always wanted 4 (or more) different styles in a demo reel to assess the quality of an artist before he/she even gets the chance to be hired.
I hope this may help you, 'cause I can see some potential in your work.