Little pic of me swirling orange juice on second birthday (5)
I believe the answer is:
emoji
'little pic' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'me swirling orange juice on second birthday' is the wordplay.
'swirling' indicates an anagram (letters get swirled around).
'orange juice' becomes 'oj' (abbreviation).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'second birthday' becomes 'i' (2nd letter of 'birthday').
'me' with letters rearranged gives 'em'.
'em'+'oj'+'i'='EMOJI'
'of' is the link.
Can you help me to learn more?
(Another definition for emoji that I've seen is " Graphic expression".)