Did you know that you can make adjustments to pictures right in Microsoft Word? That's right, you can make simple changes to pictures right in Word, no special picture software is required. All you need is the Picture Toolbar:
It should appear automatically whenever you click on a picture but if it doesn't you can bring it up by going to the "View" menu and then selecting "Toolbars" and then selecting "Picture" from the list.
Here is an illustration of what each toolbar button does:
Here are some samples of the effects you can get using the picture toolbar: