Why doesn't it look exactly like the design?

The finished design will not look exactly as it did on paper. This is for a number of reasons:

• An image (printed or on screen) is usually a jpg or other graphics file type.  A website is displayed using html.  This is different technology so will inevitably look slightly different.
• The design was likely developed before all the final content was available.  This affects screen length (for example) and different images may be used.
• Colours displayed on a screen cannot look exactly like they do on paper.  Colours on a screen are made from light, whereas colours on a page are made from ink.  
• Printed material often has a much higher resolution that a screen.

We will be able to explain any differences, so if you are concerned feel free to ask.