It's hard to tell if the first one is any good due to angle/lighting, but it looks more like ura mawashi geri than a straight up mawashi geri (which is the normal roundhouse kick). The second one looks fine in isolation, but, depending on your style, at an actual graduation you would have to perform it from zenkutsu dachi and probably chain it together with another kick (ushiro geri in my style). You'd have to show you could do that combination 5 times in a row with correct technique without losing balance and keeping the same height to qualify for a black belt.
Dude, this is ura mawashi geri..