Looks alright, i don't think you did a good job at making the middle second seem like it belonged with the rest of the image, but thats just me; also it probably would flow much better if that blue was taken out, cause right now as is it looks like you made a image with a space stock and some brushing and then laid the outer image on top and did a layer mask. Eliminating the blue (or at least changing the color to on that better fits the surroundings) i think would help improve the image's believability.
i really really really like the concept, it just was not executed correctly work on blending, contrast, and fix up the fx