1. Generic headshot serious face.

2. Scrub-a-dub serious face.

3. British beefy serious face.

4. "I'll take your photo even though it will never look as good as a photo of me" serious face.

5. Speedo serious face.

Via ftape.com
6. Fence-sitting serious face.

7. Doppleganger serious face.

8. Billowing rug serious face.
9. Prom date OF YOUR DREAMS serious face.

10. Romantic farmboy OF YOUR DREAMS serious face.

Via wordpress.com
(You know, the type who leaves you love notes hidden in bales of hay but marked with a special ribbon that only you know about so you know they're there. Excuse me while I go back to my Harlequin romance novels.)
11. Striptease OF YOUR DREAMS serious face.

12. Dustbowl serious face.

13. Casual stroll serious face.

14. Dazzling blue-eyed serious face.

15. Bathtub serious face.

16. Vintage serious face.

17. Fiery serious face.

18. Borderline obscene serious face.

19. Perfectly groomed serious face.

20. Slightly dishevelled serious face.

Via blogger.com
21. Furry aviator hat serious face.

22. Jorts serious face.

23. Angled serious face.

24. Pajama-clad serious face.

25. Too much to handle serious face.
26. Popped collar serious face.

27. Possibly constipated serious face.

28. "What do you mean you've run out of stuffed crust pizzas? I placed my order 45 minutes ago" serious face

29. Nonchalant serious face.

Via blogger.com
30. Neon jeans serious face.

Via http://www.i.thefashionisto.com
31. Barbizon pose serious face.

Via bloginity.com
32. Canine serious face.

Via heart.co.uk
Not a serious face but quite frankly WHO CARES.
Via ivebeenkilt.tumblr.com
Who isn't jealous of this dog right now/forever?