Most often the case with any piece, believe it or not, is that the actual final execution of it is easy part.  The bulk of the time, thought and effort goes into planning...laying things out...arranging the composition for the fullest effect. 

There's the initial inspiration (which is fairly instant) there is the converting that inspiration into a workable plan/compostion/layout (that could take days...man hour upon man hour of working and reworking "measure twice, cut once" is a phrase that applies here.  I like to have everything figured out to the last line before I get right down to making the final piece. because when I don't...it's usually a nightmare).  The final execution of it is usually the least stressful or mentally taxing part of the whole process.

Usually.

This piece is the exception that proves the rule. The composition is pretty straight forward, because that is what's called for. I did a little fancy stuff via adding a third vanishing point to have the observer feel they are looking down at the scene...

Just for good measure I made sure an equal amount of percision was used on all of the planes...

I decided to give myself a little breathing room and do the planes on a different layer, but basically they get refined to the same degree as the final penciled first layer. (below)

and that...was the easy part. 

What I am neck deep in now is the tedious precise inking of all those lines and details. It is a grind. I'm usuing a no.0 brush ( gives you about a .25 line wide...uhm...think of half of a mechanical pencil's line) to give it as much life and charm and energy as I can.   And that...in this case...takes quite a while.