I love how in images like this, its the way simple things come together to create something really really nice to look at! The central figure has a strong silhouette, solid anatomy, and good use of colors. On top of that, the simple purple 'cloudy' background creates a lovely simple frame for him, and the blue glowing overlay communicates a sense of bursting power in a very effective manner! I'm very impressed, this feels like it should be on the cover of a comic book. Keep it up!