hi im ray and welcome to toribash.k off to judge your replay!to define a decap would be short for decapitate, which means to remove the head and not just and random part of the body.and another few tips you should remember while making replays are these;
-its unsightly to stop moving
-dont be afraid to stop moving the parts which have another on the other side of the body (like this: contract right wrist,contract left wrist)
-relax. you know that joint stance which makes you look like a ragdoll? it helps alot
-use chest joint and core joints alot.and when your not using them its good to hav them relaxed
thats all i can think of right now.good luck!!