no worries boss,
personally,
i wouldn't really call it a need for depiction or representation...But rather how Jesus really is...
He can be everything that is Good..He can be a Child where His obedience as a child can be an inspiration for us as God's children
He can be a begar who is in need which reminds us about being generous...etc...
or the good shepherd,Jesus with sheeps....or Christ the King! Jesus with Crown...
and these depictions can really impact something to us esp at certain times and emotions...
if we are in pain, we see Jesus as a healer...if we feel we are lost in decisions...Jesus can be our guide...somthing like that...
that's why we also see pictures of Jesus with kids, Jesus smiling, Jesus with a phone saying "please call, i miss you"
though those images are not really DOCTRINAL but that's the idea...
History also records about early Saints having visions or experiences of Jesus as a child
so i think that's how the depiction of Jesus as a child started...not really sure though...
you may wanna check the story of St.Christopher
or the History of the Sinulog dance
Intercessor and Mediator are not at all the same bai
Jesus is our GOAL...the people who would HELP us reach the GOAL are what we call intercessors...
i'm not sure if a Goal can also be an intercessor at the same time...

prayers of our friends and the saints...that is an example of intercession.
Jesus saving us from eternal death.. is mediation..bridge between man and God. the one doing the Act not a supporter of the act.