Can I go back to my doctor for more filler? We used 1/2 syringe in sides of my upper lip and what was left in my lower (Photo)

Your photos shows that you have a very nice result from the fillers. It is a good idea to wait few weeks before injecting more fillers, first to let the swelling go down and see the real results, also to decide if you really want more filler, most of the times too much it does not look good. Your doctor will be the best one to advice you about this.

If you want more and feel it will give you an improved result, see your physician and ask for more.  The amount should be individualzed based on what is attractive and natural for your face.  Less is sometimes more.  Best, Dr. Emer.

If you want more filler then you should go back to your doctor and pay for more filler to be added if it is deemed appropriate. Best of luck.

Your lips look beautiful.  It can take two weeks to see the full result.  Do you know which filler was used?  If it was a hyaluronic acid filler such as Juvederm or Restylane, it is possible to have filler added in another week.  If you are planning on more filler for your upper lip, you will require filler in your lower lip to maintain a natural look.

This is a very common issue of the patient trying to get more than 1 syringe of filler can do. Just understand the filler has a costs and short cutting the amounts only makes it very hard to stretch it. Most need 2 syringes.. 

It looks like you got a nice result. More is not always better and a good doctor will tell you when to stop. The problem today is people over do the treatments and start looking unnatural. Good luck