Not sure what you mean by the polygonal artstyle. I assume its the sharp edges? So maybe add more padding or bevel for softer edges? But yeah I was going for a realistic approach. I agree though the armor looks like its laser cut and too sharp, definitely needs some hammering. You're right the color of the leather kinda…
looks ace! my only crit is that sharp wave in the bottom left corner, my eye keeps getting pulled to it cos of both the sharpness and the highlight. Other than the nitpick I think you did a great job :)