As an iPad user, close to no parallax and you can add a "paperlike" (the actual name of the brand) onn top of the screen tha has that nice matte finish and the right texture (and you can change it when you scratched it like a cat tree). Photoshop is really bad on iPad and other programs not that great but you have Procreate that is a really powerful tool (and costs 9.99 €, period !).