1)Select a single layer from the Layers panel.
2) I mostly used the drop shadow effect and texture effect.
3) A David Hockney collage is a group of pictures taken from different angles to make it seem as one.
- Do one of the following: Double-click the layer, outside the layer name or thumbnail. ...
- Set effect options in the Layer Style dialog box. See Layer style options.
- Add other effects to the style, if desired.
2) I mostly used the drop shadow effect and texture effect.
3) A David Hockney collage is a group of pictures taken from different angles to make it seem as one.