Hey man.

You dont really have full body renders, so its not easy for me to critisize. I am not a specialist at gibsons. So I wont talk about the modeling, even though it looks fine. Now your renders on the second page is what I will critisize. You HDRI isnt suitable for this. I see plenty of white, like the knob and a big area on the body, which is too harsh. You body material reflects the floor way to much, and it should be shown on the sides only. You must work on those materials. I do like the knobs you have on the sides. Those look fairly realistic. Your metal isnt as reflective as it is in real life, especially on guitars. A quick fix would be to change your HDRI.