@Pyrochan-dolls: The sun is large. Yes. However, even if the sun was sized normally I still don't know the rules. What I do know is whether large or normal I still have the Light Vanishing Point in place. How the LVP interacts with other unknown perspective elements is what I'm after.
@Pyrochan-dolls: I had a feeling that the shadows would run clear of the page. When I was 100% winging it I was drawing the shadows contained entirely on the page. It's then I recalled plenty of sunrises and sunsets where my shadow would be cast along the ground for dozens of feet.
Your picture is a great example showing the problem I'm trying to solve. However, it's still unclear how long the total shadow needs to be as well as the individual parts of the shadow. For example how would it be properly determined where to start drawing the lowest branch on the tree shadow? There is a method I just don't know it.
I forgot to add that I realize that this is a curved perspective but if we can establish what works for a non curved perspective I can adequately 'wing it'. Also there is a third VP all the way to the left. It's a measuring point but I don't think we need to worry about that for right now.
Because your figure is actually in the middle of the light source you would still be in the shadow as the camera lens, so the shadow would actually continue off the page. If you drew a straight line that connected the vanishing point to the feet and just carried it running on, the bit that's running on is the shadow right til it falls offf the page.