Yeah, just some basic stuff in Photoshop. Hard Round brush for the basic effect, some blue with a fuzzy brush on an Overlay layer, and then a Linear Dodge layer with a lighter color to add the glowing effect. No filters or anything really fancy, just default brushes and layer styles.
I absolutely love the spectrum of the arrow. I can't seem grasp my head around the pose: it's done so gracefully and smoothly. ( // ' o ' // ) It's so complex, it would be awkward in real life. But you've done an amazing job.
Yeah, the pose is a bit awkward. It's kind of a "standing on the edge of a cliff" sort of pose, as if she was gonna take a dive, but she's also holding her bow and whatnot. It was sort of inspired by this one Hyung-Tae Kim drawing I saw a while back.