Off the top of my head...
Pandaria set: Your shoulders and helmet aren't matching the rest of the armour.
White berserk set: Your helmet/shoulders look incredibly out of place. However I do like everything else maybe with a better tabard.
Wild set: Everything other than the gloves is decent but the gloves stick out like a sore thumb.
Shaman SoO set: The line between your boots and your legs is incredibly jarring.
I don't want to be a debbie downer and it looks like you enjoy transmog but a lot of the sets are waaaay too rough around the edges.