Sorry, but I'm finding the subject somewhat uninteresting and the attempt at getting a high key effect ended up seeming to be more of a photo needing contrast and levels adjustments. Was there a filter applied in post or something?
I'm not seeing this as high key at all. My understanding of high key is using lighting to reduce or eliminate shadows while still often having a high amount of contrast. Simply moving the brightness slider up doesn't make a high key photo. I hope this helps.
Your processing didn't give off the effect you wanted. High key images are mostly and almost completely done in camera using correct exposure and lighting.