Dynamic is better. Dynamic means more energy, force, and interest:

1. Look at the background

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When shooting selfies, take the background into account. Ideal to have interesting shapes, forms and objects in the background.

For example this selfie I shot in this pentagonal mirror:

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Note how I simplified the shapes and forms to show you the general visual gist of the composition:

And a side by side:

2. Experiment

Look at the top of the frame, if it kisses the top of the frame:

Note in this example, there is no negative space on top of the frame:

For the second image, there is a bit of negative space on top:

Side by side view:

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And small thumbnails:

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