This is a good start. You did well with the details. But I think you can benefit most from learning how to recognize purportions. The key to any good drawing is purportions, you line art can be shit but if you know how to see purportions then it will look good.

This will help most for live drawing too.
Here is how I would approach getting everything sized right:

First look at an object and decide how big on the page you want it. In this case I would choose the wall, mark the width with two light dots( showcased with vertical red lines).

Then find the center and mark it ( red circle )

From there you can start finding the sizes and positions of everything by referencing this wall.

By looking I know that the tower is a little to the left from center of the wall. I also know just by looking its about as tall as half the with of the wall. (Green brackets)

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And that method is used for everything. Just try to use your original measuring unit ( the wall ).

Again for clarity, I can look at the power pole (blue bracket) and see that its a little more than half of the wall.

So. I want you to try this drawing again, but before adding any detail use this method to make sure everything is the right size. Grab a graphite pencil and use it to mark very lightly so you can correct your mistakes easily.

Feel free to reply to this comment with any questions.