Well, its a bit hard to tell from the slight angle the photo is take in. It doesn't look terrible though, it would depend on what the guitar is going to be used for also. If the guitar was going to be used for a rendered shot it wouldn't be very good for a couple of reasons. The reason i say this is
(these are just my opinions)
1) Below the headstock where the nut and the neck would start downwards seems a bit to large maybe scale it in a bit to give it more defintion.
2) The neck from the photo doesn't look strait although that might be the rotation on the model in the photo.
3) The top two curves in the body are pointy, add in some more edges along the side to give it a more curved body.
For a rendered shot the sharp pointed body, not perfectly strait neck, would look bad and rough, however if you are using it for a low poly game model and not a rendered shot it would not be bad at all with a decent texture and just add in some more curve to the body. As for strings if it was a rendered shot i would use thin cylinders, for a game i wouldn't even make strings i would have the strings in the texture.
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