the uc logo - lovely line work, but try to trim off the square-ish angles at the bottom of the mouth
the cross is a good addition but he's looking for something unholy, which wouldn't make sense, try adding some other symbolism in there like 616, satanic circle etc
as for color and other stuff, not sure what to do with that but a solid inner color would be nice, maybe fire or something
alazhar - great colors and reinterpretation of the original sketch but it will most definitely look bad once resized
not sure how big or small it will be but you should try making the font bigger, or bolder so that readability is easy at any size
mantra - the logo lacks depth or style, feels like a really simple design, you could probably change this by getting rid of some of the stroking and add overlapping and slightly transparent ones
the words fit good but also lack any style but that's really easy for you to fix
good work, you seem to be getting better with taking up requests