One easy way I check to see if a painting is balanced is to do the 360 turnaround. Put the painting on its side – does it look right?
Repeat until the work has been seen from all sides, up and down, both sideways views… assess whether the painting makes sense and feels right. Look for the triangle (usually Isosceles) and balance the shapes and negative spaces. Sometimes the triangle will be a perfect Isosceles triangle with the base on the lower edge, other times inverted or sideways. It will be discreet. It will be there.