What version of PowerPoint are you using?
For PowerPoint 2003 and above, select the first picture, then click Slide
Show (or Animation tab for PowerPoint 2007) > Custom Animation.
Click Add Effect > Entrance. Choose an effect of your choice.
Repeat this for the 2nd and 3rd pictures.
Modify Start: "On Click" to "With Previous" if you want 3 pictures to
animate at the same time.
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Shawn Toh (tohlz)
Microsoft MVP PowerPoint
Site Updated: Oct 20, 2007
(Amazing PowerPoint animations, artworks, games here)
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate