You can use Photoshop's generative fill feature to quickly combine 2 images together.

In this short video, we will open 2 very different images, create a selection around the area we want to fill, and then merge them together with a single click.

Generative Fill | Photoshop: https://youtu.be/gaERaBeP7Ls

Harmonization Neural Filter | Photoshop: https://youtu.be/Aq9LQfEis9k

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Images used in the video (affiliate):

Desert: https://1.envato.market/q4jVXn

City skyline: https://1.envato.market/xkGODk

Running person: https://1.envato.market/DKNBzy

Shark: https://1.envato.market/9gY2ae

Water bottle: https://1.envato.market/jrLVAn

Waterfall: https://1.envato.market/PyDBN6

Hot spring: https://1.envato.market/5gNKPn