Very well put together in terms of colors and contrast. The nebula/space-scape is a bit flat in comparison of the planets depth.
What could've been done here is that if you'd increased the shading and contrast also on the nebula/backpiece you would've get a much more harmonical piece that flows well together at a higher state than it does now.
To intensify the glow/bright light here a choice of bringing more stars in the composition might be beneficial. I'm not saying you should add stars all over, just concentrate a couple more around the exposed area to make it pop in a way that really would nail this already amazing piece.
Great job mate, it's all in tuning the details from here, you're insanely good at these space-scenes. Last 1,5 year you've really brought the A-game.
It's realy cool. I don't know, what kind of critique that you requested I can write here. I look at this image and feel a unique romanticism of cosmic space, so far, so beautyful. Added to favs with pleasure!
Great use of colours mate, but i feel that you overused the light-effects around the shiny spot, as in, the texture around the focal point is imo a bit too lit up. That extra light could instead be diverted into removing some shadows on the backside of the planet, you know, making it feel more rounded and shizzleness.