The horizontal flipping is a must I think.. I've been doing it for quite a quite since once I did a chop and when I flipped to make a second version it looked like shit.
Also I really think when working most of the chops, reference work is really really important if you want to achieve good realistic results.
Looking back is quite same as multi tasking I guess?
I think whats most important is the reference work on many other photographs. not only a model you want to achieve but things like door lines what you notice when walking down the road lol. or general reflection types and shadows.. among others.
Thanks Jack this WILL be useful. I have to share your new set of tuts to my friend.
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