Greetings,
Let me try to help and explain whats happening here.
Things to be aware of.
Monitor calibration. What you see isn't always what you get. Your monitor might not be calibrated and therefore unable to display the actual colors of your photos,. This can result in photos which are too dark, too light or have inaccurate color rendition.
Image resolution. If you take a low resolution image and try to print it at high resolution, it will become blurry, since the DPI (dots per inch) is too low for the size image you selected. Lets take the thumbnail image of your profile as an example.
Low resolution
Now lets tell your printer to print the same file at 4x6 resolution.
See how blurry it becomes.
There is probably nothing wrong with your printer. What might help:
Calibrate your monitor for true color rendition
Use a photo editing application to correct the colors, brightness, etc.
Ensure the size of your files are large enough to print clearly at the size you want.
