How is this sketchnoting technique different to the traditional note taking?
The sketchnoting technique is different to traditional note taking in that it allows visual personalisation in the exercise of note taking. Traditional note taking is normally linear in form consisting of text oriented formatting e.g. grouping information under headings, subheadings etc. By interpreting information in a free flowing visual manner, sketchnoting allows the note taker to create multiple visual, textual and structural cues for themselves thereby allowing themselves to become more active in the learning process.

Sketchnoting also allows the participant to create their own language which can overcome the barriers of language and text structure. In addition, the participant can become more involved in deciding what they consider to be the key deliverables by putting visual emphasis on the points they consider to be most important.
Below is the result of the first exercise undertook in class.
Design Thinking – Jae-Hee Park
How does this visual approach facilitate communication of your ideas? Conversely, how does it prevent it? 

This visual approach facilitates the communication of  ideas by allowing the sketchnoter to think more actively about how they can best visualise the information that is being presented to them. 

Thinking more laterally about how one can create visual cues which helps retain information allows the notetaker to become more engaged in processing the delivered information

Personal challenges as a sketchnoter:

The exercises in class consisted of interpreting both visual and auditory information and transforming both into visual mnemonics. I found this process challenging but at the same time engaging and more 'fun' than traditional note taking.

One down side that I found with sketchnoting was that I found it challenging to structure my ideas in a logical manner. Sometimes, in trying to create a workable visual cue I was distracted from the information that was being delivered. Sketchnoting is a skill that needs to be developed over time as much of the pros of sketchnoting are tied in with the participants ability to sketch.