Hello , I have been discussing this matter with a fellow artist who was modeling a human head .
for instance the artist here is doing the left side of the head as most of the artists as far as I can notice , I prefer doing the right side , does that have anything to do with being right or left hemisphered in your opinions ?

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EDIT: Wait. Now that I think of it. I guess i do work on the left side and mirror to the right side. Damn it!
but when i'm sculpting with symmetry it doesn't really matter , i'll just be all over the place ^^
Why? Because the default key binding for the Left view in 3ds Max is 'L' whereas 'R' is to switch to scaling, granted, i could press 'V' and then 'R' or just change the key binding but meh, who cares.
like reading text from left to right, it just makes more sense for my brain...at least i think thats why.
But usually with mirroring on, it's either side.
models I'm working on need to face to the right and so the left side is what I see
The actual world direction doesn't matter too much as it's easy to mirror across any axis (x, y, z, user defined) in Modo.
That said, I usually have the model/viewport situated so that I seem to be working with the "left" side of a model.
this
ditto