My reference for this image was rather blurry in some places, so I improvised. If anyone sees specifics that are wrong, please feel free to point them out so I can fix them. UPDATE : So it turns out that SlayerMan118 made an excellent observation, my original reference image had been resized, skewing the image. I've got a better quality reference now, and will be redoing this from scratch.
I've redone this from a higher quality source. Hopefully most of the mistakes are gone now.
Update: Color corrected Twilight