Concrit? OK. But keep in mind that this is coming from a person who has an ACE (former Photoshop certificate issued by Adobe) and mild chromesthesia. Given what you said about your graphic skills in general, you're pretty good, actually. I would try a different colour for the logo in the first image. The yellow is killing me and I have seen blue, red and white on SW covers, so you wouldn't actually be breaking the rule if you do it. Some light dropshadow and slight blending with added transparency could help as well. The typeface can be outline, like it's on my cover. Another two small issues I see here are the difference in colours on the element on the right and the fact that the main starship is just floating. Some sort of "schwung" could be applied to it. The second cover looks much more natural, but the said schwung, or anything else that would imply that the ship is moving would make it even better. Yellow could be transitioning to gold in order to fit with the top image and the top image, which I assume has been copied and pasted, could use some extra background removal, as I can see bits of white here and there. Now, this is just me, but I would add a couple more speeders deep, deep below, possibly removing the cars. Or I would cut out the very bottom of the picture, so it's less earthy and more starwarsy.