Pan's Labyrinth Vs. The Little Mermaid

My idea is to try and tie in The Little Mermaid with Pan's Labyrinth. I saw the similarities when the Faun was telling Ofelia about the task she has to complete. Then at one point the Faun make sure to tell her that she only has three days left to complete the tasks. In The Little Mermaid, Ursula gives Ariel three days to get the kiss from the Prince and to stay a human for ever. Granted Ofelia doesn't need to obtain a kiss, but she has to complete the tasks in order to gain her immortality and to be reunited with her father.