>>84084156I would try to add more detailing on the ground in the first two panels. Maybe at least some shadowing under/around the buildings, and the bones in the second panel. I like how the skeleton sort of wraps around the landscape, though. It's a simple, small thing, but adds believable depth.
I'd also try to maybe not put so many planets in the sky. 1, 2, or 3 look really, really cool, but a sky filled with giant planets just doesn't really make much sense from a real science perspective.
Also, I feel like the flying thing--as neat as it looks--really gets lost in the last panel. His black spotting is almost identical to the ground below. From the thumbnail, you can't even tell he's there, and the fact that his wings are almost the same size as the chunks of ground you black spotted below, it gives it an off look.
>>84084186Same thing to say about the planets in this page. Also, seems kind of odd to have the title like, 2/3 the way down the page.
You're going for that old-school, pulpy sci-fi, and those usually had a big establishing shot panel with the title in it on the first page, or they just went all out and had a big one-panel landscape splash page with the title.