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This is a combination of two images and using layer mask to substract or add parts of the masked layer.

If you are not familiar with layer mask, here's a tutorial: https://www.youtube.com/watch?v=QgmTl2Hbdsc

I'll try to explain

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I used these two picture.

Drag the cloud picture onto you mountain picture, drop down the opacity of the cloud layer and reposition the cloud layer

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Apply a layer mask to the cloud layer

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With the layer mask active and black as foreground color and white as background color and a soft brush, brush away the parts of the cloud layer you do not need. (see tutorial)

Do not use the eraser tool! That is working destructively.

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Vary the brush size and opacity to achieve the result you want.

But first and very important, learn using layer mask.