When looking at a High Key picture, you will probably notice two things right away. (Other than the happy-happy-joy-joy mood of the picture) The first thing is that the picture is bright. Yes – to create a high key image you need to set your exposure levels to high values. You will want to watch out, though not to over expose.
The other noticeable feature of High Key images is the lack of contrast. In addition for the tone being bright, you will notice that it is almost even across the scene. This is achieved by carefully setting the lighting of the picture. More about that later.A third feature, that need closer attention to notice is the lack of shadows in the picture. The shadows cast by the model (or subject) are suppressed by lighting in the scene.
My efforts are rushed but it's something I'll try again.