The person appears to be a/an White Male, approximately 20 to 29 years old.
Key mistakes to avoid when delivering a presentation in a professional or academic setting include: lacking a clear and logical structure, going off-topic instead of staying focused, speaking too quickly or unclearly, failing to maintain eye contact and use effective body language, neglecting to incorporate visuals or engage the audience, not practicing sufficiently and being unprepared with the material, overwhelming the audience with too much information, skipping pauses for questions, and not concluding with a strong, actionable summary.
Key mistakes to avoid when delivering a professional presentation include: failing to establish a clear structure, rambling instead of staying focused, speaking too quickly or unclearly, neglecting eye contact and effective body language, omitting visuals or audience engagement, insufficient rehearsal and lack of material mastery, overwhelming the audience with information, not allowing pauses for questions, and neglecting to prepare a concise and actionable conclusion.