Add "Number of Photos"

You can try these, however, I do not think they are exposed outside of a prepared showcase item itself (if not, they will be in SC 2.6.0)
{$item.image_attach_count}
{$item.file_attach_count}

For TEMP, you can use the attachment count: {$item.attach_count}

template: nflj_showcase_layout_list_view_item

scroll down till you find this

HTML:

                <xen:if is="{$item.last_update}">
                    <dl class="updatedStats">
                        <dt>{xen:phrase nflj_showcase_updated}:</dt>
                        <dd><xen:datetime time="$item.last_update" /></dd>
                    </dl>
                </xen:if>

Place this directly above it...

HTML:

                <dl class="updatedStats">
                    <dt>{xen:phrase nflj_showcase_images}:</dt>
                    <dd>{xen:number $item.attach_count}</dd>
                </dl>

When the next version of SC comes out, you can replace the attach_count data with image_attach_count data.