His appearance has only been described once:

“He stood at least 10 feet tall. His armor was gray-green and covered in runes carved at the beginning of time.”
— Reign of Shadows, Chapter 10

His mask has also only been described once, however this won’t matter for the first half of this contest:

“His mask was the most ornate anyone had ever seen – more than just a Kanohi, it was a true work of art. The metallic protodermis from which it was forged was arranged in intricate patterns and designs, each reflecting one of the many cultures that flourished in the universe. The eye slits were angular and pointed, giving him an air of both wisdom and a vague sense of menace.”
— Reign of Shadows, Chapter 10

As such, your Artakha should:

-Be approximately 60% outwardly green. This can be any green, but it can only be one shade of green. Lime is allowed. We will make an exception if the eye stalk is a different green from the character. This is because sand green (canonically the color of Artakha 3) is harder to find. As such, the green on the MOC will be recolored to sand green in the final artwork.
-Imposing.
-Be tall. He is described as being 10 feet tall. Our best comparison would be Tobduk, who has a canon model and is also 10 feet tall. For reference, the Tobduk model is only slightly taller than the Brutaka set.
-Wield a hammer 6. He does not and never did wield the Staff of Artakha. If you include the Staff, your entry will be disqualified.