To borrow a phrase from the British Army, Proper Preparation Prevents Poor Performance.
One of things my art suffers from isn't always limitations of my ability. It's lack of planning ahead or thinking things through.
For instance: Using markers, but forgetting the sketchbook is not marker paper.
Result: Bleed through onto caribou I'd been working on.
Solution: Did i forge ahead and make lemonade? Yes,
Kinda, but still....
I could have had a flawless execution.
It's just a sketchbook, you would say.
I don't have an answer for that other than if you don't think and plan in
the sketchbook stage, you are probably less likely to be planning at the final stag either.