I asked Jedi Killer if he knew what the picture of Obi-Wan kneeling before Yoda is about. Here's his reply (highlight to read):

"This has to be a scene Lucas decided to include at the last minute. He must have made it up during filming, because it's not in the script. It's probably a scene towards the end, taking place in the Theed Palace. Perhaps Yoda is pleading
with Obi-Wan not to train Anakin, and Obi-Wan telling Yoda that he must, because it was his promise to Qui-Gon.  That's my guess."

Jedi Killer continues (highlight to read):

"I'm glad Lucas decided to include another Obi-Wan / Yoda scene since, as
it was, they really only had one moment in the film together: in the Jedi Council. Here's what happens: the Council members have tested Anakin and agree that the Force is strong with him; however, they tell Qui-Gon he is not to be trained...

QUI-GON: He is the chosen one... you see it in him.

YODA: Clouded is this boy's future.  His youth masks his fate.

QUI-GON: I will train him, then.  I take Anakin as my Padawan learner.

YODA: An apprentice you have, Qui-Gon.  Not wise to take on a second.

QUI-GON: Obi-Wan is ready...

OBI-WAN: I am ready to face the trials!

YODA: Ready so early, are you?  What know you of ready?

Are we going to see Obi-Wan's "trials" in Episode II..?"

Thanks to Jedi Killer for the information! I love these few lines of dialogue, and especially the last two lines, since they immediately remind us of a very similar situation between Luke and Yoda on Dagobah!