These are very pleasing to the eye, honestly.
For the Sacred one: I think that if you blurred out different aspects of the 'background' of the text, you might be able to make the crystals pop out more and it'd have more of a depth effect look to it, most of the small symbols being shown (I think) is better without any blur applied to them, they're cool and don't take all of the attention away from the focal point. I'd also leave the bottom of the S un-blurred and let that have more of a clean contour to it. I love the contrasting on this one in particular.
For the Malzahar one: there are slight spots on the A's that seem to throw the colors off and maybe a transition of color or more of a gradient when going from pink to purple on the H might make it more smooth. There's also an apparent straight cut line on the galaxy layer behind Malzahar on the right side that could be faded out more as well as on his arm I believe.
Those are the two I wanted to give my opinion on because I believe they're the top 2 in here.
KIU!
~Vayvi