Frustration is setting in

Hello to all writers out there - is this normal? To feel doubt in your ability as a writer? I am now questioning the cover of my book - I love the picture, but wonder if its not 'eye-catching' enough? Should there be more detail perhaps? More colour? More clues as to the story within?

I am thinking about a box with a cake inside. Do I look at the box first, or the cake? Is it the box that draws me to the shelf to have a closer look, or is it the knowledge that the cake inside is one of my favourites and therefore, I know I'll like it??

Feedback would be deeply appreciated from fellow authors. I have asked others and have had a mixed response - to 'yes, it is a bit bland, needs more colour, trees, castle etc, to 'no' it is an intriguing picture and draws me in wondering what it means...?

I am confident about the story, but the sales don't reflect this, or lack of sales I should say.

And that's another thing, do people say to your face, they will definately buy the book, and then they don't? Sooooo many people have done that to me, I am losing trust in the human race!!