I went for something completely different this time and decided to fill in the missing parts of the Vahi with my own interpretation of what I think should go there. It was quite easy to do but it took a long time because I had to meticulously draw vector objects with the pen tool and move them into their exact places. I quite like how it came out, though.
You can download it from my Photobucket, on a black, white, or no background: Photo Storage
Now this looks like a complete mask of time 
This comes pretty close to what I would expect from the full Vahi.
The only issue I have, is that the eye holes are too close together.
Still, great job.
CHEESE!
Anyways, it looks a bit odd. But it still looks suitable for a Mask of Time.
That’s what I feel it would look like.
Don’t you mean, Mask of Cheese? (I wonder what type of cheese it is…)
Nice job though, it looks pretty good.
Swiss cheese, aged in the finest protodermis.
Edit: I’m open to suggestions for my next mask.
Looks a lot like a mcdonald’s mask with the golden arch on top. That’s just me though.
I like it, but something bugs me about it… Maybe it’s too square?
I think it’s made for a Mata head.
That looks great!
Just move the eyes a bit farther apart and I think it’d look grand.
Also, on a semi related note, is it bad that I really want the chestpiece printing on the unavoidable Toa of Time to resemble a clock?
I can’t move the eyes apart because that’s how they are on the actual canon vahi.
SWISS CHEESE!!!
In all seriousness, this is pretty cool. It seems a bit too simple to be a standard BIONICLE Kanohi though.