The 2nd symbol that has half a broken diamond could also be mirrored having a half broken diamond on the bottom part as well. I wasn't able to get a clear look at the bottom half.
The screen is black because her game was loading.
Talking about the lesser mentioned contestants here:
Honestly Brooklyn looks good here and ate it up, the lower tones and the hair etc. I couldn't take my eyes off of her.
'더 데뷔: 드림아카데미' 'FEARLESS' 퍼포먼스 영상│ The Debut: Dream Academy / MTN STAR
Antifragile, Karlee sounds amazing here. Its a shame they did her dirty and took bad takes for the live performances. (she was also sick) BUT she stated and I quote that "she knew damn well they had better takes"
'더 데뷔: 드림아카데미' 'ANTIFRAGILE' 퍼포먼스 영상 │ The Debut: Dream Academy / MTN STAR
All in all it really boils down to styling and coaching. Everything they do, they are told to do.
Everything they wear, they are told to wear.
Hair style, colour, makeeup. etc.
Look at Karlee, Brooklyn and Marquise now vs then. They look incredible today.