I wanted a beer bottle in my box, but didn't want it to dominate. I knew it should stand in the corner, but that involved perspective and foreshortening, and I really didn't want to get into that. I spent a few days procrastinating, avoiding, and plea bargaining with myself. Eventually, the beer bottle ended up where it was always meant to be.
It's been a while since I actually had to map out such things correctly, and the process made me think that it was a good tutorial, especially since this piece is comparatively simple perspective with only one vanishing point. I'm also aware some people have nightmares about perspective. (Yeah, I know, that's a stretch for this week's word.) You can click on the pics to make them larger to see details.
2. In one-point perspective, all vertical lines (things that move away from the viewer) will go to the vanishing point. All things facing the viewer will be flat circles and rectangles.
In reality, I made this all harder than it needed to be when I was actually painting the bottle. I made the tutorial afterwards and could smack myself for all extra work I put into it. But, my extra work is an opportunity for a lesson. Don't get caught up with the details. What is the basic form of what you're trying to reproduce? Start there. It's like drawing a face. Don't start with an eyelash. Start with an oval and figure out where the eyes go first. Maybe I should do a tutorial on faces sometime? This painting was a whole lot of itsy bitsy portraits on bumpy canvas. The finished painting is 18" x 24".