Nice colour scheme on the Slann, and I really like the red and black striped carnosaur! Great work. I think the metal one you should mute the metallic effect a little bit, keep it but make it less metallic with a little grey and some wash.
Actually you should get some wash or ink for all your models. They have a nice base at the moment, but adding a bit of wash is very fast and easy, it will quickly and simply add some shading and depth to your painting and make those models look a lot better for very little investment. Definitely worth it.