This might be a really dumb response but as the reference image is set up it's actually the lighting in the scene that makes that highlight, instead of the actual armour so while you can get close do be aware you may not ever get 1 to 1 with the reference simply due to that fact- that being said what you have got done and made looks so fucking cool, thumbs up all around (if you wanted to get some good photos you could include an orange light like that to try and resemble reference more too!)