After an hour and a half I had the image on the (left) which I was very happy about. It was definitely creepy and disturbing but it was not creepy enough, something was missing that I felt was present in my previous designs.

Upon looking over my previous concepts I noticed I blacked out the face or kept it obscured or hidden in some way. So I decided to try it here by simply blacking out the face as if being permanently shrouded by the presence of an unnatural dread.

I felt the addition made the concept allot stronger in its creepiness as the shadow effectively renders the witches face unreadable which makes her much more menacing and disturbing.

After coming across a design that I liked I decided to render her final design. I drew up some thumbnail images of her waving her shadowy magic possibly in a gloomy forest of cave.

I found it difficult to come up with an idea that I liked for the final image as I felt a backdrop would inter-fear with getting across the idea of the witch, so I decided to drop it and use the thumbnail I created in my previous studies as It prity much nailed what I wanted from the character, design wise and it already had a strong eerie pose.

I opened up the thumbnail and doped it onto a big canvas in Photoshop and began to refine it using elements of my other thumbnails such as the design for the torn robes that came about in later concepts.

I did some more 20 minuet thumbnails, this time looking at of the possible appearance of the witch during her mortal lifespan.
These designs could also be used for her form that resembles her mortal appearance to better interact with her victims by creating the illusion of dealing with an ordinary woman. Making deals in this form would be far more successful as any potential souls would otherwise be intimidated or fearful of her true self.

After spending some time on the witch's twisted abominations I decided to re visit the witch and to concept her base or initial form.
The above images were a series of 20 minuet thumbnails to quickly flesh out my ideas.

The witch in the story appears in a variety of similar forms depending on her intentions. Her most common features include long white flowing hair obscuring a dark almost blacked out face. She is adorned by heavily torn robes but predominately she is nude, this was a deliberate choice to capture a distinct dark and eerie pagan ambience to the witch.

The Grey Wonderer
The witch may appear as a shrivelled old woman horribly doubled over and decrepit  making use of an ancient twisted looking staff as a walking stick. This form is known as the grey, or white wanderer and it is her most common form when interacting with unsuspecting victims.
In truth this form dates back to her original appearance as an elderly witch that has haunted the woods for many centuries. It is not until recently she has been augmented by the power of Nazjikile resulting in her now more ethereal and wraith like appearance seemingly restoring her youth and womanly figure. She acquires and augments her power by offering the children of a nearby village as sacrifice to Nazjikile the ancient dark God of chaos and death.

The Shadow Witch
The shadow witch is her new form which is a direct result of her gaining more and more power from her sacrifices to Nazjikile. No longer a decrepit old hag, she had become a creature of shadow and darkness, no longer bound by reality she floats eerily through the air as if moving through an invisible hidden realm as well as the mortal world.
As expected her power is greatly enhanced no longer bound by the limits of her mortal frame or the need to channel magic through a catalyst such as her staff she is free to cast and weave magic from the dark depths of the nether-realm and suffer non of the dangerous concisenesses that inhibit mortal wizards and sorceress. 

In the end I decided to go with the floating wraith like apparition for her initial form as it ticked all the boxes I wanted for my witch. The design moved away from the stereotype of the green skinned cackling broom raiding fiend of the night and more towards an ethereal wraith, an unnatural force of the underworld causing disease, famine and other atrocities using her dark shadowy magic.

Here are some High rez sketches of the various Homunis Creatures. These abominations were created from the decaying rotten corpses of the witch's victims, essentially they are the failed results of the witch's experiments trying to uncover the secrets of life and death.