Multisite Pull Recent Image Attachments from Blog ID

Use switch_to_blog to switch blog contexts to a specific blog ID. From there on it’s all down to get_posts of the attachment type. And switching back to the current context with restore_current_blog.

Something like this:

switch_to_blog( $blog_id );

$args = array( 'post_type' => 'attachment', 'numberposts' => 5, 'orderby' => 'post_date', 'order'=> 'ASC' );

foreach ( get_posts( $args ) as $attachment ) {
    echo wp_get_attachment_image( $attachment->ID );
}

restore_current_blog();