  In this paper, sharp results on operator Young's inequality are obtained. We
first obtain sharp multiplicative refinements and reverses for the operator
Young's inequality. Secondly, we give an additive result, which improves a
well-known inequality due to Tominaga. We also provide some estimates for
$A{{\sharp}_{v}}B-A{{\nabla }_{v}}B$ in which $v\notin \left[ 0,1 \right]$.
