String is definitely too short. Measure from nock to nock along the back of the unstrung bow following the contour of the bow. Get a string that's 3 inches shorter than that measurement.
The bow also looks out of tiller. Usually, the top limb will have a bit more bend than the bottom limb. This one has a lot more. The way to fix that is to reduce the weight of the lower limb, but that's rather complicated for a novice.
The overly short string makes the tiller look worse than it is. With that string, the bow is already half drawn. With a longer string, the bow is probably shootable as is.