This is an excellent presentation and Dr. McConnell is a good role model for presenting.
This is a longer video, but well worth your time. She goes into more depth than you will need for 12 minutes, but many of her points are applicable to your paper or blog presentations. The talk is divided into: Minutes 0 to 19:10 - Using Powerpoint wisely and Minutes 19:10 to 42:08 - How to structure a science presentation. See commentator Wes Suhler below the video for a further breakdown and links to the sections of the presentation.
For paper presentations, you don't have to present every figure in the paper, just the most important for understanding. Make "data dives" for two or three points. For blog posts, to make the "data dives" mentioned in this talk, you might use one important experiment and result from each of two to three papers.