A very minor thing I noticed, but about the flower on the left (or the hope fragments if it floats your boat), compared to the petals in between, the other two sets look like they're...blending in. Try making use of the color you used for anti-aliasing to separate them. Sorry if I was hard to follow. 
Still, it was a minor thing. I believe everything else was actually done well! The palette, the outlining, the anti-aliasing and shading...keep up the good work!
Hey, Thank you for both the comment and the feedback! ( 'ω')
To be fair I wasn't too happy with how the flower had turned out either but I couldn't figure out what was bothering me so much.