There are two ways to reduce the size of a picture. If the byte size needs to be reduced, it has to be done with image editing software. If just the pixel size needs to be reduced, we can do it with a simple code.
In this case, just the pixel size needs to be reduced. This code should do the trick:
<img width="200" src="http://www.wdwinfo.com/sites/jenwales/stormminnie.jpg">
and should give you: <img width="200" src="http://www.wdwinfo.com/sites/jenwales/stormminnie.jpg">