Sad little bloom…why?

[PaphLover]

This is the third blooming of my Charlesworthii x, and this bloom is decidedly smaller, thinner, and generally quite pathetic looking compared to its large and in charge predecessors. Seems strange since the plant is so much bigger now. What did I do wrong? Too little water? Too little light? Too small a pot? I suppose this could just be a one-off, but it seems more likely that it's caused by culture inadequacies on my part.