Space Marine

Hi everyone! First, I apologize for my approximate english and for the bad quality of the pictures, this armor mix is just a concept. My aim is to create an armor mix based on the Space Marines from the universe Warhammer 40k. For those who don't know what is a Space Marine, I added to this post a picture of one of them. On the strength of your experience, could you compare and propose ideas to improve this set? Regarding the color scheme, it is modifiable, there are a huge range of color scheme for the Space Marines. Thank you for it! :)