What kind of photograph is best used for a portrait ?
The photograph you want to use has to be sharp and clear.
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The minimal picture resolution should be 880 x 600 pix, with a maximal possible
definition of the details such as eyelashes, folds of the eyelids etc. I strongly recommend the highest possible resolution , over 1000 pix, as the better the quality of the chosen photo, better the end result of the portrait.
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The photograph chosen should
have minimal background ( as seen on this pictures ) :
Good Wrong
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As for the hyper realistic portraits , it is vital to send a photograph that
has not been airbrushed, with visible wrinkles, skin pores in a professional quality.