Steps to update the smileys:

1. From the emoji-data catalog, https://projects.iamcal.com/emoji-data/table.htm, choose the proper icon from img-google column:
- s/smiley - :blush:
- s/biggrin - :grin:
- s/wink - :wink:
- s/mixed - :confused:
- s/thoughtful - :face_with_raised_eyebrow:
- s/tongueout - :stuck_out_tongue_winking_eye:
- s/cool - :sunglasses:
- s/approve - :slightly_smiling_face:
- s/wideeyes - :open_mouth:
- s/clown - :clown_face:
- s/sad - :white_frowning_face:
- s/shy - :flushed:
- s/blush - :face_with_hand_over_mouth:
- s/kiss - :kissing_heart:
- s/surprise - :astonished:
- s/blackeye - :face_with_head_bandage:
- s/angry - :rage:
- s/dead - :skull_and_crossbones:
- s/sleepy - :sleeping:
- s/evil - :smiling_imp:
- s/heart - :heart:
- s/yes - :+1:
- s/no - :-1:
- s/egg - :egg:

2. Download each of them into the pix/s folder.

3. Crop the content (if required).