I think we need an absorbing surface and tile cannot, hence it must be sticky

You can use Modge Podge for photo transfer

Decoupage is gluing paper on surface, you can use colours on paper.

no...for glass you can buy glass painting colours

Ya

Yes you can. I have made a lot of decoupage bottles and used fevicryl acrylic colours.

Yes

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"Thanks for checking out our DIY recipes. We have thousands of recipes that come from our users, that most of the time contain step by step method. Some are without the steps and we still upload them to motivate our artists and inspire other users to recreate the articles. However, to be chosen for as the Masterpiece , artists must include step by step recipes. We have introduced this special award to encourage more and more people to give you complete recipes of articles. Hope this helps ! #KeepCreating"