Just to add... that a valid Poser 12 serial can be had for $48 from graphixly .com and (whatever the specs say) it will run on Windows 8.x. If you'r doing photoreal rather than line-art / comic-book / sketch, then it will be a big time saver and would probably pay for itself in terms of electricity costs to run the graphics-card over a year. That's assuming you also have a fast graphics card.

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Learn the Secrets of Poser 11 and Line-art Filters.