1st Attempt: Bad Cut Out! Using Magnetic Lasso Tool I attempted this cut out and changed the background from blue to green. I had difficulty with the hair and edges of the coat.
Brightening the background: Changed it to a violet - much easier as the subject was far cleaner. Used the quick selection tool for this.
Adding in eyes: Lucky for me my subject didn't change anything other than opening and closing her eyes which made the job easier. Potentially her eyes maybe slightly smaller than they should be.
Brightening the sky: AFTER / This was relatively easy in that it was a straight line. Although the tiny bumps in the guttering were harder to change than I would have thought. I think the sky it too bright now and the details of the cloud are somewhat over blown but the exercise was useful all the same.