Hey man, great work.
As a fellow artist, i'd love to help you out.
By portable, I assume you mean Smart Phone/ Tablet, Photoshop.
The best version of that is called PS TOUCH.
Its available for both Android and IOS.
It does cost money, BUT you may download it free using the website "4shared.com" or App (4shared) Right on your phone/tablet. No PC needed.
It's basically a website server where users upload all sorts of data for public download.
Just make sure if its an android, that the file is ".apk". Im not sure what the IOS extension is.
Good Luck.
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