You have some very nice motive power, but I love that PA diesel!!!
What do you have in mind for the elevated track? Are you going to blend it into the scenery as rock ridges, or what?
In the first video, there is a shot where your track is right against the edge of the layout. Is your facia going to come up a bit over the edge to prevent derailments from going to the floor?
It's a nice lake, but they make a material called Water Effects. You might consider using some to add a few ripples to the surface...right now it's a bit too smooth.
I like what you've done, though...nice layout.