When you're first starting to shoot in Raw, one of the things that you'll probably notice right off the bat is that your images, once uploaded to the computer, look a little dull. This initial impression of shooting Raw can be a little bit confusing to some because the image, viewed in the back of the LCD scree, looks perfectly fine. This experience can also sometimes be off-putting.
I'm here to tell you that you shouldn't be discouraged, there's a reason that your Raw photos don't look great right away, and it's (usually) not your fault.
Raw files are what are commonly known as lossless files. They are called this because they are capturing every bit of information that the sensor can capture. They are not compressed. This is a good this is because it enables you to have greater flexibility when processing your files. When you make adjustments, you're actually pulling out information from within the file itself!
Because of this, you actually need to pull out the information from the file that you do want to use. You need to add sharpening, contrast and any other setting that you thing should be in your final photo.
Before and After
So why does the image look so good on the back of the screen? Your images look good on the screen because they don't display the raw information. What you see in the back on the LCD screen is a Jpeg preview, or what the images would look like if adjustments are made to it.
The bottom line is that adjustment need to be made to Raw files for them to look good. Even a little bit of color correcting and sharpening goes a long way.