Open you images in photoshop, I will use below images
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgtLduOZq7BaFUoVWdMczYjPoXLRqpqZT6BhafQ9sgECryZCmhQiGTPHx3cfo8BQaVXNy5DBreo7sB8LZ2vYQTxttMt7Cl1cVHpFxcfBFdwcUPt_3K0C9lZvrzHZY7UxXpMPSVrzbX0EQ/s320/1024_beyonce-knowles-face-desktop-wallpaper-1809846764.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEWGLy38J7QHY23dB8Brh2xKNAzLuBVkNlMIdJM_TF2bJKG10m1oCgCqwQUiMV5prhd3w3ggH1M9b5zhJRZFpj03ABxIxYzqwIZdoEAorpE-geP8VoeP2w8MfbqcsDaDJU2KdpxOjv1vA/s320/yellow_lily_flower_wallpaper.jpg)
Remove flower background using Erase tool and Magic erase Tool
Then drag the flower on top of girls image, then click CTRL+T to resize and position the flower using handles
Apply burn tool to make the flower a bit darker
Then add noise to make it look real
Filter - Noise - Add Noise, then will set amount to 2, and makesure Gaussian and Monochromatic is selected
Go to Image - Adjustments - Exposure and Brightness and contrast to fix color as you desire
Below is my final result