Turn any photo into a dot grid artwork with these Photoshop actions. You'll get great results with dots that change size. They get larger in brighter areas and smaller in darker areas. Free download available.
We are not going to place the image of the cave straight into our canvas, we only need small pieces of the stock image (Little Island) to create our cave, so we’re only going to open it. Go to File -> Open to open the stock in another tab.
Now select the Pen Tool (Shortcut: P) and make a random selection in a random part of the island. Then, right click it and select Make Selection. Leave the Feather Radius at 0px. Here’s one example:
Now hit Ctrl/Cmd+C to copy it, go back to our project, and hit Ctrl/Cmd+V to paste it. Make sure that you’re pasting it above all the other layers.
We’re going to build our cave using these small pieces of the island stock. The first thing you should do after placing a new piece in the project is to drag it to the right place with the Move Tool (Shortcut:V) and create a layer mask for it (we did that a couple of times already).