begin{figure}[H]
centering
    begin{tikzpicture}
    node (root){includegraphics[scale=0.08]{img/hanging-over-the-key.eps}}
    child {node (a){includegraphics[scale=0.08]{img/key.eps} }}
    child {node (b){includegraphics[scale=0.08]{img/key.eps} }}
    child {node (c){includegraphics[scale=0.08]{img/key.eps} }};
    path (b) -- (c) node [midway] {$cdots$};
    path[->, dashed] (root) edge node {} (b);
    path[->] (root) edge node {} (a);
    path[->] (root) edge node {} (c);
    end{tikzpicture}
end{figure}