pretty narly explosion on the planet but i think your planet could use alot of work, its very blured and undetailed
work on your planet a bit more especially the shadow explosion looks pretty big too me but its good maybe better then what i can make
Its really not bad for a first try. But yeah, the planet kinda over takes the entire image. Perhaps not making it so big next time.
ill do another and get rid of the black also. and fix the planet up more i have a good idea on what i did wrong