I get a very strong sense of peace when viewing this deviation, the cold blue nebula gives off a very calming feel and is really easy on the eyes, and it does indeed, have a very dusty feel to it, so you did a really nice minimalistic job on that! I also like what you did with the 2 stars next to eachother, dont see that too often.
Planet is pretty much flawless, perhaps a slight color variation to liven up the atmosphere. The smaller planet eclipsing the larger sun seems a little bit out of place, due to its lighting, I'm assuming its supposed to be further away from the largest planet, and if thats the case, I think it should be brighter, giving it a much more distant view.
Now the starfield, it may have been your choice to keep it simple in this one, but for me, it seems a little dull, bringing down the life in the piece just a bit.. perhaps maybe just a few brighter stars here and there, nothing overboard, just something so the viewers eyes can light up, although it isnt the main focus of the scene, so its very minor. Besides, I know you could do a really awesome starfield if you wanted, so I'm not worried.
Over all, this is a very enjoyable scene to look at, with some very minor issues. Your work has that soft feel to it, giving the viewer a very realistic view. Nothing is oversharpened and all of the objects seem to fit in place. Just keep it up man, dont be afraid to try different techniques, and deffinately dont be afraid to try something crazy Its all about trial and error. Your space art future looks very bright.
Great job on the main planet, the shading and texturing is nice and natural I think (too many space artists go for the oversharpened and overcontrasted planet look which can be too much for a scene of simple serenity in space) nice scene