hustle 3d perspective study

In need of improving my 3d perspective drawing, I put up an exercise by putting some wooden toy parts randomly on a table and tried to draw them as fast as possible (no eraser)

Here's the result

The picture above wasn't used as reference, it was added to get an idea of the whole composition.

hustle : "If there is one key thing I could convey to anyone reading this is to hustle. You will never be prepared for the things you are capable of doing. You will achieve your greatest accomplishments not by building up a grand framework of skill and then deftly creating something glorious, but by starting small and persevering in making it better and better. It is never an easy road and you will gain a grand framework of skills, but you have to push your boundaries to grow."