RE: price, I would have no problem forking over 2-3k for the kind of work you do based on the pic I just saw on the first page of this forum. For artistic things like this I think its hard to set a hard price. Most times I feel the amount of time spent should factor in. Maybe come up with a rough hourly rate and base prices (at least partially) on that.
To me, the 500L range seem most reasonable for quick jobs with minimal editing, profile pics with in-world backgrounds with maybe some text, light effects, borders etc in photoshop.
I know a guy that does great morphs, but only charges 200L per pic. He is super quick though so for the time spent it is probably worth it to him. I just recorded a DJ intro for someone and as it was my first one I had no idea what to charge. She told me a typical price was 2k, but after hearing the final product she asked if i would take 5k (to which i said yes lol). That was between 3-4 hrs of time spent for about a 90 second recording.
What i might suggest is (for advertising purposes) decide on an absolute minimum price based on your most average work with low-ish time spent, and say "starting at XXX L$" and indicate that the final asking price will depend on complexity/time.
People who want to bargin you down obviously don't have an appreciation for what you do and I wouldn't waste much time trying to work with them. If you are getting a lot of your business from newbies who can't or won't pay what your work is worth, perhaps it would be worthwhile for you to offer different styles of work, and come up with a more newbie friendly service that takes significantly less time for you to compelte a pic. In my experience, art, or music, or whatever else I create, tends to be regarded very highly by non-artists, musicians etc, where-as I'm here thinking "that is some of my worst work lol".