to make a long story short just set the pixels as large as you can 8000x8000 or 4000x4000.

you can make smaller in photoshop.

don't forget in 1996 a big render was 1000x1000,there small in 2016.

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance