Let $R$ be an associative ring with identity. First we prove some results about zero-divisor graphs of reversible rings. Then we study the zero-divisors of the skew power series ring $R\left[\!\left[ x;\,\alpha \right]\!\right]$, whenever $R$ is reversible $\alpha$-compatible. Moreover, we compare the diameter and girth of the zero-divisor graphs of $\Gamma \left( R \right),\,\Gamma \left( R[x;\,\alpha ,\,\delta ] \right)$, and $\Gamma \left( R\left[\!\left[ x;\,\alpha \right]\!\right] \right)$, when $R$ is reversible and $\left( \alpha ,\,\delta \right)$-compatible.