ok here is a new version...thanks a lot for your comments, it seems i got a bit hasty in the end with mistakes like wrong blending modes or lines in the image :/refine
i removed the lines, reworked the planets exposure, moved the motion blur layer to fit properly and changed the blending mode of the vignette so that it there is no blurry left corner...
the noise however is there on purpose as mass effect has a very grainy look

render time for the planet was around 20-30 minutes on my core i5 notebook...