How to reveal an image as if it were being drawn

That actually worked out great. I went through and used a few different brush paths etc and got what I was looking for.

Would you also happen to know how to pan objects on the Z axis through the camera, as if they are doing a fly by (or through in this case)? I found a few tutorials where an object is placed and one moves the camera to create the effect; however, I am trying to do this with a stationary camera.

I did an attempt where I moved an object on my desired path, but there is a point where instead of flying through and past the designated camera area, it is almost as if there is a smaller secondary camera window that is cropping the image at a certain point. Up until that point it looks fine, but at some indiscriminate section, it hits what appears to be a secondary-invisible window pane which kills the perspective growth in the main camera view/plane.