Ah, the right-leaning... I may have a way to be able to fix that fairly quickly (as in, once you get into the habit, the problem resolves itself), but I need to know how you start a drawing.
Do you build the pose as a light sketch first? Such as drawing a basic stick figure and then fleshing it out? Or do you jump right into the finished linework? If it's the latter, I suggest drawing a basic stick figure to finalize the pose first, and then
drawing the finished linework. This will help you spot and correct errors with the pose more easily, as you won't have as much to change as you would with starting with a finished drawing.
With this method, you'll be able to experiment with poses without having to draw a finished picture. Let me find an example...
Here's a page from Drawing Comics the Marvel Way
, a book that I highly recommend.
Note how the top set of sketches are loosely done, with little detail in the way of basic proportions. Starting your drawing with a light sketch is a good habit to get into and it will help with the balance issue.
Here's another page with some more examples, including dynamic poses:
Hope that helps and welcome to the boards!