The best option is to look at the big selling items already in the market. This will give you an idea of the kind of versatility, attention to detail and design quality that is needed.
Always think quality over quantity but at the same time it’s only a PSD so visible versatility and options are important. That said adding features or elements for the sake of it and which don’t really fit is only going to be detrimental.
As for the one above - it’s far from the worst seen here but I still feel it is not quite there in terms of quality for here.
That is something else to consider, ‘ok’ design is not good enough for PSDs here - while there will always be some which shouldn’t get through, generally speaking the bar is very high.
There is also a trend recently of PSDs becoming increasingly creative and imaginative in layout.