Thanks mondrian for your fast response about this man's portrait, that seems to be rather legible, for your question was asked around here and most people's first choice was Dr Sigmund Freud too!
Tintin's character # 1
see
http://www.bulledair.com/planches/planche_tintin1_1106413418_06e70
is most likely the 'unseen'
cameo of Freud (1856-1939), the father of psychoanalysis*, for this man's sketch by Herge in 1929 does actually match with:
1 no known picture of Alfred Zwaenepoel.
2 the spontaneous designation of Freud by people who don't know about Tintinoliterature, but are still educated!
3 Freud's deformed right jaw, the result of the many facial operations undergone since 1923 for a cancer.
see
http://www.entnet.org/museum/freud.cfm
4 the many puns* & slips of the tongue read in the corpus, that call up those described by Freud in
Psychopathology* of Everyday Life in 1914.
see
The Castafiore Emerald* & Les Bijoux Ravis* &
http://store.doverpublications.com/0486428613.html
5 Tintin being kind of a psychoanalysis* for Herge, as he went on drawing Tintin but left a likely depressing
Jungian psychoanalyst (Dr Ricklin*, Zurich, Switzerland, 1959) who firmly recommended he should stop with Tintin, as reported in
Herge by P.Assouline, 1996, chapter 10.
see also
http://www.youngvic.org/imgs/resourcepack/11343963 , p.19.
6 the early and narrow links between Tintin and psychoanalysis*, links confessed by Herge himself and clearly reported by N.Sadoul in the film
Tintin et Moi*.
7 a known figure good at displaying words about people's imaginary thoughts, but unable to read 'images'**, for Freud refused to admit what his eyes could see in 1886, when they saw patently abused children.
see
http://www.regardconscient.net/archives/0203realinceste.html#top
Eleven years later, he published a most personal theory based on a much distorted Oedipus' myth
see
http://www.ottorank.com/oed.htm &
http://www.regardconscient.net/archives/0104oedipe.html
that wouldn't point at his own childhood and own father's misbehaviour,
see
http://www.regardconscient.net/archives/0212jakobfreud.html
but would try and solve his personal problem by infering children were responsible for being abused!
see
http://www.regardconscient.net/archives/0203realinceste.html
He reportedly didn't apply his own theory during his whole lifetime, but alas "Freud's courage in acknowledging the extent of [child abuse] was not shared by the majority of his colleagues.
Most, like Jung, simply avoided the topic. Others, who noted that large numbers of their patients had clear memories of [child abuse], blamed the victim, saying (...) that the molestation "was desired by the child unconsciously (...)" .
full text on
http://www.psychohistory.com/index.html in article about 'Universality etc', 14th paragraph.
This smart theory is still echoed in 2006 by scholars who most seriously ban 'abuseur' (abuser) from their vocabulary!
see
http://www.academie-francaise.fr/dictionnaire/index.html
Fortunately other scholars publish more empathic & more relevant studies on the subject, such as the recent 'Livre Noir de la Psychanalyse' (by C.Meyer, Les Arenes, 2005) that recalls, in its very subtitle
'How to live, think and feel better without Freud'***,
see
http://www.arenes.fr/livres/fiche-livre.php?numero_livre=119
that psychoanalysis* can also harm patients.
Some may even find better relief just by themselves, e.g. by the means of writing & doing ...art!
* please search for related threads.
** such an
aniconete* 1st character matches rather well with an 'unseen rebus'*.
*** "Vivre, penser et aller mieux sans Freud".