I make texture with my phone in an application called Autodesk Sketchbook
after i made a head texture.....i can't go ahead to make it sphere,and i must open my pc to see it how it look while in game......the problem is i can only switch on my pc on the weekend...

Is there any solution/s to make a spherical head texture in my phone with good resolution??

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If you're referring to Play Store, then I don't think there is one. :/

i found one
but
the resolution is quite bad :/

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I don't think you'll find a solution here.
You may go on a forum especially for apps?