Trying to draw in perspective?

Just getting back in to an old hobby of mine drawing or, perhaps its more like sketching? years ago i never really took it to seriously and just grabbed a pencil and some paper and just scribbled what i thought what i was looking at? trouble was it always (what ever i drew?) ended up looking all a little flat and two dimensional. So as we are picking it back up again many years down the line i thought i would try a little harder.

I found many good videos on youtube that shows the basics about drawing in perspective etc, so with my new knowledge i thought i would put it to practice, the detail is a little lacking scruffy and also a little wonky! but i would really appreciate any comments, opinions, thoughts on it? as regards depth of field etc, many thanks andrew.