It's not a bad idea and there are some parts that look nice. The trouble it's not clear and readable yet (the mara body is particularly messy). I suggest you darken the areas between bones (near black perhaps) and apply a subtle dirty gradient to the bones to darken them. If the rest of the alien is dark enough, the bones will still stand out and you won't blind us!
I don't think you need those swirly patterns either; the theme's strong enough without them. If you are going to include them, make sure they're obviously part of the theme and not just a doodle on top of it.
Anyhows, keep at it! It's always fun to see (and judge) other peoples work!