Your ellipses are looking much better. Try to make your straight lines straighter. They have a wobbly feel to them. Learn to sketch lines to a vanishing point. That will help get the shapes be in perspective and also help you with short and long lines.
I tend to use my wrist for small lines but my entire arm for long perspective lines.
Practice making up more complex shapes. I made this a while back but it's an example of what I'm talking about.http://i191.photobucket.com/albums/z60/ ... 10a723.jpg