I'd like to start by saying that I'm not trying to be an asshole here ...
No ... not really ...
Your pictures are poorly composed, over exposed, grainy, over edited, out of focus, wrong white balanced ... but should you continue? Of course you should!
Look, I took this ages ago using a Rebel XSi:
http://flic.kr/p/9mhSeA
It's complete and utter garbage but now I create images like this:
http://flic.kr/p/cciycs
http://flic.kr/p/c8xSVb
http://flic.kr/p/bAu7Tv
What you have to do is keep improving. Asking for a critique of your work is a good, important step towards improving.
PICTURE 1
The image is very soft in terms of focus and the lighting and color is washed out ... it lacks contrast and vibrance.
PICTURE 2
This one is a sharp image but you have some blown highlight on the right hand side petals (notice how the petal is pure white and we've lost all detail in it) and your white balance is off, the whole picture has a yellow tint to it.
PICTURE 3
There's a distracting shadow in the upper left corner of the frame and you have alot of negative (empty) space BEHIND the flower. In terms of composition, if you are using negative space to help draw the yee to your subject, it;s best to put it in front of the subject than behind.
Again, the colors are very mutes and you depth of field is a bit too shallow.
PICTURE 4
When doing headshots or portraits, it;s important not to slice off parts of a persons head. The shot is also ridiculously grainy and the calaor is all wrong.
PICTURE 5
When shooting on a relfective surface, never use the pop up flash, use off camera lighting, even if it's just a desk lamp and place it at an angle. It's also very hard to use the auto focus on a shiny surface.
PICTURE 6
Stop trying to edit your pictures to make them interesting ... create interesting shots straight out of camera. Here, you've cut off part of the head again and the beads are more distracting than anything else.
When we look at a picture, we normally look for a subject or point of interest and in this picture, my eye is drawn to the beads instead of the model.
PICTURE 7
Again, you've tried to edit a horrible shot to make it interesting but you know the old saying: "Garbage in, garbage out". You can't make a great cake out of rotten eggs.
The picture is over edited, obviously over exposed ...
PICTURE 8
Again, direct flash and reflective surface (water) and the angle does nothing for the shot.
So yeah, these are pretty bad but that doesn't mean you should give up. Here is my advice:
1- Stop editing your pictures.
You are using editing as a crutch to try to make un-interested and flawed images interesting and it;s not working. Focus on the photography and once you've mastered the basics of that THEN you can worry about editing.
2- Learn the art and science of photography.
Start with the basics:
Learn about exposure (how ISO, aperture and shutter speed are used to control how much light reaches the sensor).
Learn how to properly focus and read up on something called "Depth of Field".
Learn some of the basics of composition ... things like the rule of thirds, leading lines, the use of negative space ...
3- pick up some books
"Understanding Exposure" and "Photographic Composition are two great sources.
4- Join a photography club
Great place to learn, share and get a critique of your work.
Good luck and keep trying.