What are you using for your lighting solution? Looks really generic and almost as if theres only ambient light. This isnt helping your normals, There not reading well if at all. I'd suggest using Xoliul's shader or import this into marmoset toolbag for your beauty shots. Typically when your making low poly game art you want to display it in engine. A spec map would also help this a lot!
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Keep up the good work!