Hi and welcome! I don't know much about the pictures, but I do know some of the abbreviations. (I'm sure there's a list somewhere, but here's the ones I can think of right now).
DH=Dear Husband
DW=Dear Wife
DD=dear daughter
Ds=dear son
LOL=laugh out loud
KWIM=know what I mean?
AFAIK=as far as I know
IIRC=if I remember correctly
BF=boyfriend, could also mean best friend
ROTFL=rolling on the floor laughing
ROTFLMAO=rolling on the floor laughing my ___ off
TTC=trying to conceive-don't know how often you'll see that one around here
That's all I can think of right now. HTH! (hope that helps!)