Face changes throughout the day? (Photos)

Why does my face shape change as the day progresses? The picture of me in the blue shirt was right after I worked out. My cheeks are firm, jawline is visible, and everything looks fairly proportionate. The second picture however is what happens as the day progresses. My face becomes assymetric, jawline isn't visible, and cheeks aren't as elastic. Sagging jowels perhaps? This has been bothering me for quite some time and I just don't understand why my facial structure changes as the day progresses.

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