There are already reflections in the water. Can't you see them? It has the statue reflection and the starfish reflection and also the cloud reflection in the water. As for the shadows, they are following the same angle as the shadow on the knee and chin. See that knee shadow? It is heading slightly to the left. The chin shadow seems to be going straight down so I figured I needed to use both source shadows to make my own shadows. I made the ivy leaf and starfish shadows aim down and slightly left. The dark area you see above the leaves on the knee are cracks in the statue. Those areas are holes. The ivy is growing through those cracks.
Now if you still think the shadows are wrong, which way do you think they ought to go if not slightly down and to the left?

I moved the shadows 6 pixels more to the right and 3 pixels further down and made the reflection more visible for you.

Thanks for your help CMYK.

Thanks George

Thanks Sylvie.