Edges are key in this subject. Softer, lost edges don’t hold the eye. While sharper edges grab the viewer there must be a happy medium of the two. Blending the edges between colors is necessary ( I think), but, sometimes, I can get carried away and lose the brilliance I sought. It is all in the practice and learning, I suppose. When enough paintings have been done that one more doesn’t matter, then the artist does things without the worry of failure. That is why it is so important to paint often without concern for the outcome.
It seems I am gaining ground a little at a time. Sort of like climbing a sandy hill; up three steps and slide back two. Progress comes from repeated forward steps, each time with small (but significant) gains.