Okay lol you're trying to do it the hard way so I'll show you how to draw in one point perspective. The finished image took me 2 minutes to draw in paint, so you can see how easy this is.
Step one Draw a horizontal line. This represents the horizon, how far you can see, given the curvature of the world. The higher up the line is from the bottom of the image, the lower down your point of vision is.
Step two Mark out a point on the horizontal line. This represents the vanishing point, the point where everything in your image vanishes in the distance.
Step three Draw the base line at the bottom of your image, this represents what you can see at your feet when you're looking at the horizon. I've marked this in red.
Step four Connect each corner to your vanishing point with as straight a line as possible. This forms the boundaries of the road in front of you.
Step five Add a vertical line connected to your base line, then connect the corner to your vanishing point. These are construction lines. You can use as many of these as you have objects in your image. You can already see.
Step six Begin. You start by drawing the things in the very distance first. So that'd be the sky, the ground and any objects that are very far away, such as the trees, then begin working back to the base line, adding objects and confining them to the shape your construction lines have made. This makes them adhere to the perspective of the image, things that are further away will appear smaller, no matter how large they are.
Step seven Erase the construction lines. You would draw these on a separate layer in pr3 then simply delete the layer.
In the example image, the road in front of you is a small footpath, the trees are very small. Drawing the trees above the horizon line will make the trees larger than you. Even if they are bigger than the construction line, they'll still adhere to the perspective of the image if you follow the steps above.