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The images do not show, since they do not refer to an image-file (.jpg).
I had at the two images you tried to link to and it appears they were shot with the on-board flash.
"dull" or "exciting" or "whatever" is all a function of light. The on-board throws harsh light directly forward. The stretched skin on the cheeks , chin and forehead will throw more of that light back in the same direction. The eye-sockets, due to their shapes, will throw it in other directions.
Almost all direct single flash shots will look something like this, which is why diffusers or reflectors are often used. Alternately bounced flash - e.g. bounced off the ceiling or a wall - is used to create more flattering light.
The on-board flash is at it's best in bright daylight for what is called fill-flash. For example in harsh sunlight from above, some strong dark shadows are cast on the face under the eyebrows and under the nose, and the fill-flash will equalize the light some.
Flash-photography is a whole field in and of itself. I recommend you have a look at the tutorials section here and check out the "How to use your flash outdoors" as inspiration for how you can best utilize your on-baord flash.
There is a whole community on Flickr dedicated to flash-photography around the website www.strobist.com
where you can dive into everything from basics to "holycow - 16 strobes in the middle of the Desert" crazy stuff - all looking very kewl!