The effect of the service and its natural appearance is largely dependent on the artistic skill of the injector. Yes, technique really does make a difference. Also which product you get is critical. Many injectors use a so-called "smooth" filler. That is marketing speak for runny. Why are runny fillers so popular? Most injectors make lumps and bumps when they inject product. They lack the skill to work with the high G prime fillers. The runny fillers have low G prime, a measure of how the products functions as a solid in the tissue. The runny fillers spread out after injection and they tendency corrects lumps and bumps left by the injector. Sounds good but it is not. The problem is that the tendency of these products to spread means that instead of getting a product that precisely hold where it has been placed, a characteristic critical for a natural result, product immediately spreads to places it should not. That is how one gets a lip treatment that leads to lip shelf-fullness above the lip that looks anything but natural. Products that cause this include Juvederms, Belotero, Restylane Silk, Restylane Refyne and Restylane Defyne. Products that don't do this: Restylane. Note that Restylane Lyft has a G prime so high that it should not be used at the lip edge. Know your products and your injector.