many things look messed up here including the way he's holding the hammer looks like its the wrong way around.
I'd advise to simply use reference for the armour instead of making it up, then modify it for ur needs.
when u do designs like this its usually good to sketch out the figure underneath then build the armour over the top.
I use layers personally.
a little bit of extra time building a strong foundation always saves u lots of time and work later...