Hi squirrel,
It's a pleasure to encourage you, especially since you're so willing to try new things.
You may already be using these since division of vertical space in your paintings seems to indicate you understand these principles of composition already, but just in case you aren't using them:
If you're interested, and when you're ready, another feature you might want to add to your arsenal is Painter's Devine Proportion palette. Using it makes it easy to check composition. Another tool is the Layout Grid that can be used for the same purpose.
Either of them can help us place focal points and horizon lines (among other things) in a pleasing arrangement. They can also help us avoid drawing the viewer's eye out of the picture.
Keep up the good work, and always remember to make it fun! :)