Attached Link: lighting and shadows

Is there a tutorial that will help me with lighting.?!?!?!    go to the link to see what I'm talking about..

Is there a way to make the shadow go from her feet to the water edge.. then I have to really lighten the shadow for it to look right... I've even gone to a beach and had a friend stand near the water to see this..

I've got a great shadow on her glute from her left arm/hand .. but the shadow/shadows from her body should be almost invisible on the water...

Raymond