How to learn observational sketching?

reasonablepenguin

Hey guys! I'm working through Scott Robertson's How to Draw (on chapter 3 right now), and I figured I'd supplement my learning with observational drawing on the side. I want to draw mechanical things, so I figured I'd pick something I think is fairly complex, and try to copy it. I quickly noticed my proportions got way out of hand in no time at all. How do I deal with this?

I started from the area behind the seat where the tail light is, and just tried to work my way through each line, going from one neighboring line to the next. Should I try to block in major shapes first? The second I tried to place the rear wheel was the moment I realized my proportions were a disaster. Should I sketch more simple objects, or does it even matter? My reasoning was the more complex the better as far as practice goes. I appreciate any tips you can give me  

carvuliero

"Should I try to block in major shapes first?"

::That will solve most of your proportional issues

"Should I sketch more simple objects, or does it even matter?"

::I could be a faster way to learn and build confidence but other then that is up to you

I can think if few simple tools you could use to help with proportion and initial block out till you train your eyes to do what you currently doing :

National space/box and envelop
Grid
Gesture drawing
Relational measurements

Primitive shapes -> circle trapezoid and cylinder ....

Also check Bargue's drawings and I have post some exercises : https://polycount.com/discussion/200681/learn-to-see-basic-drawing-and-warm-up-exercises#latest

pistachio

For me yes, I would draw a more basic thing, jumping in with both feet very early is gonna give you a lot of pain. Already I see wonkiness on the handles/mirror.
Going from one line to next drives your eye way off, you want to keep checking proportion across the board and try to stick with that top level of the hierarchy.

Also looks like you're underestimating construction. IMO that's as important as proportion.
IIRC Bridgman and the Russian Academy held this up even more than the Bargue school and it shows. Huge emphasis on perspective and/or breaking down into planes and boxes.
(I'm no veteran but when you get into 3D, that sense of construction can only be a strength = also better communication with other specialists, if it's not through words then it's the rock solid concept speaking for itself.)

Focus on your course, but it's worth it to check out schools of thought from all over the place and the principles they have in common. Usually if they share them and they last, they add up to good art.

reasonablepenguin

@carvuliero Thanks for the images and the tips. Definitely helps clear things up about the process. I also noticed you referenced the Charles Bargue Drawing Course in your link, so I'm going to check that out as well.

@pistachio I appreciate the advice. I have faith that as I get deeper into Scott's book I'll get better at construction. 3d is exactly the reason I want to draw in the first place.