evilmonkey this looks a lot different from the original concept, it is a lot easier to make a sprite if you stick to the concept.
The attack frame was originally planned out as this:

- wikilurkercopy.png (126.66 KiB) Viewed 5374 times
so the brain wouldnt be sucked right away

.
(please also check for the other concept frames here:
https://wiki.themanaworld.org/index.php ... sal#Lurker)
On the technical side, I like how you restricted yourself to a very small number of colors.
Perspective looks off, tmw has a 45° orthogonal perspective.
The concept you are following at the moment is difficult, make it more comic style, like other in game sprites, i.e. larger Head, thicker extremities, rounder "feet" and "knees" (a good start for this is OP's pixeled version).
Your sprite at the moment completely lacks texture, you could try to give it a hairy or scaly texture.

Keep up the good work, Mister
Here are some links to tutorials that you could look at:
to get a feeling for the different steps that are helpful to be done to sprite a mob:
http://the-godlings-rapture.deviantart. ... -280927794
we also have a collection of howtos in our forums:
viewtopic.php?f=2&t=17239&hilit=tutorial.