With regards to technique, coloured pencils should be applied with patience and a light hand. At junctures where I began to get bored or tired or impatient is where I can see the mistakes, or rather, the areas from which I can learn to do better. You can't see these in the digital image of course but you can in the painting itself which is about 13"x10.5" and where the pencil marks are much more obvious.
But I like it anyway, despite the flaws. And you can see it enlarged by clicking on it in the Sketches & Drawings link on the left.