1. Create a blank canvas
Create a new canvas via File>New. Select the size from the Preset and Size options and ensure Background Contents is set to Transparent. Rotate the canvas via Image>Image Rotation>90° CW. Now open your start photo in Photoshop.
2. Build the layers
Select the Move tool, click the start photo and drag it over to your canvas. It will appear as a separate layer. Go to Edit>Free Transform and ensure the photo fits the canvas. Ctrl/right-click the photo layer, select Create A Clipping Mask.
3. Add some colour
Add a new layer and drag it to the bottom of the stack. Pick the Paint Bucket tool and select a colour from the Color Picker. Fill the new layer with colour. To reveal the photo, click on the blank middle layer and select the Brush tool.
4. Reveal the layer
Select a large round brush, 100% Opacity and set Foreground to black. Paint over the middle layer to reveal the model’s face. Select the arrow in the Brush Presets Picker. Pick Special Effects to add butterflies to the edges.