Modifying Pictures
You have two options you can choose which one that you want to do for this learn more activity.

Adding a Border to Your Pictures
<img src="address of your picture" border="1"> 
* Changing the border to a larger size will make a larger border.

OR

Changing the size of your pictures   
<img src="address of your picture" width="200" height="200">

* Changing the width and height to larger numbers will make it larger.  Changing it to smaller numbers will make the image smaller.