Initeresting
well notbad, the green color is a nice touch i thought, this reminded me of maybe some lost souls trapped in some element, you have captured that i thought, i also thought it could have been on a bigger canvas so you can show more of this maybe add some other creatures and such all around, you had a few bright spots in there i thought were neat "ORANGE/YELLOW" i think those should be brighter so they shineout abit more, just for the effect, and maybe lighten up the green tone just a tad, you have titled this "FEAR" and what you presented seems to fit that title, just a few effects here and there as i sated could help more for the showing of it, but you did present a good fear art style here, so nice job on this.
How to improve on this??? well like explained above i stated a few tips some on lighting, and maybe a larger canvas / Viewscreen, and adding more to it like a story is there anyways good job
~X~