I was told by an artist in a private message that my foundations are all wrong and my perspective is way off ,and that  i should basically go "back to basics".

So here are some "Rough" perspective practice sketches (freehand).

It's always better to get opinions when you are used to seeing your own stuff all day long.
So , what do you think? am i really that far off?

All critique is good critique at this stage. :)