I think you're already doing great! My advise would be diminishing the time for each figure, by doing so, you lightly pressure yourself to get the more details you can get in that limited time, that helps a lot to get a basic anatomical shape and, with the remaining time, you can add minor details. It can be a gradual process, increasing or diminishing the time by how comfortable you feel with each shape. I'd say to start with the 30s poses, even if you get a single line at first, but if that line itself already shows the course of action of the pose, you'll be already off to a great start!
Hope this helps even a itzy bitzy
Best wishes!