It looks like there is no air being injected into the skimmer on that pic and the water line is way too high. The water should be about even with the bottom of the collection cup.
If you leave it like it is and inject air, it will overflow the collection cup in a few mins. If you are injecting air in that pic, you have no where near enough air going into the skimmer.
btw...what brand skimmer is that?