That's not High Key, b.t.w.
For true high key, he would be wearing a white/light shirt. 'Keying' is when you match the subject's clothing/accessories to the background, so as to make the subject stand out from the background.
It's a common misconception that using a white background and being over exposed is what constitutes high key.
also, did you use a brush to whiten parts of the background out in #1? The white background is kind of weirdly non-uniform.