It would depend on the Mockup psd you want to create. Does iPad Photoshop support all the layer types you want to us in your template. Does iPad support smart object layer yet. I have not look at iPad Photoshop in a long time it was missing to many photoshop features when I last looked and I'm not a great fan of touch user interfaces and Photoshop using conflicting name and shortcuts on the iPad. IMO when using iPad Photoshop you still need a keyboard and shortcut.
Hi JJMack, thanks for replying. I study graphic design and i just bought the iPad this month, so i don’t know much about it. I have a work to do with mockups and i really need to figure this out! It doesn't ´t matter if you don't know, thanks though.
There is no standard for mockup templates. However, most Product Mockup Templates use Smart object layers for product design elements. As far as I know iPad Photoshop does not support Smart object layers. I believe Adobe will add many of desktop Photoshop features to iPad Photoshop. IMO it will take Adobe a years