You have a great start to your model but you need to work on the proportions if you want it to look similar to the concept art. The suit looks half organic and half metal, there are curves inside of the metal that would not be there. When translating concept art to 3D, you would usually try to separate what looks cool and what is actually functional.
Not adding the cuts in the joints just makes the suit look like a toy. I really do like where you are at with the suit though and it has come a long way since your start, however you still have somethings to fix.
You have this awesome detail on the edges of the legs but no where else. You should put that type of detail everywhere on the suit and then add some light scratches in the spec map. Have fun with all your maps, you will see nothing but great results. Adding a lightmap for the blue lights around the suit would add some nice detail to your characters texture.
good work, looking forward to seeing more.
