MLP THE MOVIE (skull island poster)

So with the "Storm King" I can really see where you tried to 'erase' the background. I hope you have photoshop after all I see layers. But what you want to do is use the magic wand as it can find edges better, Cut that background out, then on that layer use the feather to soften the edges. It will look less harsh in the end. If the background is a sold color then you can always screen for that color and then feather. Always feather!