Critique my cover art

I like them! I think the pictures are gorgeous. The only thing I would change is the placement of your name in the second one. I think it would look more symmetrical and balanced if you centered it at the top instead.

The outline on the text looks rough. If you can smooth it out it would look cleaner.

Try to avoid outlines on your text. Not only do they start looking weird at smaller(thumbnail) sizes, but it really makes the text stand out in a bad way. A little extra work tweaking the tone of the image behind the text, the color of the text, or its placement will usually let you achieve that contrast you are looking at. Without "boxing" in your letters.

The images are all nicely chosen, but the lettering is a bit "brutal", especially in the first 2. It kinda works in the third, but in 1 and 2 I'd try to get rid of the outline, and make the text less bold, perhaps also smaller and a little bit translucent so the image shines through. I might also change to something more cursive and elegant in the first one. It may also help to choose less extreme colors; I try to avoid the use of actual black or white and likewise, I try to desaturate the reds and yellows a bit to make them less flashy.
All in all, the lettering is very sensational, if you will.