Yeah, very empty. Not much going on.
I do think I see what you mean. Keeping in mind that I have no idea what I'm talking about here, I think you might have too much focus on the explosion itself. Those two lines going up the sides both point towards it exclusively, and the eyes get drawn up right past RD. There is a lot of separation between her and the explosion too; it appears there is something connecting them, but it looks more like a levitation beam from an alien spacecraft at this point.
I think you could maybe angle the image a bit more, just for some extra dynamism, and move RD more in front of the explosion, maybe add some features to it to make it very clear that she is coming out from it (that little extra burst you see in movies and stuff).
Finally the the pony herself is maybe lacking a bit of focus in pose, with limbs going every which way. Just some things to think about, take or leave as you see fit.
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Day 309:
Not very anatomically sound.
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Day 310:
Another pony head.
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Days 311-2:
Pony cardinal. Kind of a style smush.
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Days 313-5, 317-9:
This one was a victim of its own inspirational potential. Kept wanting to finish it and do a nice job, but kept only getting in short increments that pushed it into the next day. Eventually I just had to be done with it even though it was nowhere near where I wanted. Also suffered from a bit of a style change midway.
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Day 316:
This one was going to be a break from the last, but I forgot about it.
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Day 320:
Just a face.
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Days 321-2:
Another unfinished one, this one purposefully so.