Hi !!! I think we have two thing to say : In first time, it's beatiful ! Colors are good, tuning correct, the fact to put your subject on a book is also a good idea !!! Honestly, I really like this pict ! But I think also, it can be so much better ! Your pict was shot with a academic way : You are exactly above your subject, the background with the text is good, but with a little part of a table, or another support it could make a reminder beetween the colr (of the support) and the color of the leaf or the key for example. And so, the light are a little little bit too "flash", the reflects of the left of the key is a really little bit (I'll use and abuse this expression because it's really a little détail x) not limited with the white of the background. So, I love to the suject : this key is incredible ! With the little clock, it can develop our imagination... What it can open ? A door which open on the past ? A secret passage ? A fairy shell... So it's infinity ! So I now and watch the rest of your gallery ! You make a really good work ! Good luck !
(So sorry if you cannot understand me, I'm not a good english speaker...)
Well Actually I like this picture pretty much. I think that as someone already told you, colors are well balanced and the white point is really good. For what concerns the "conceptual" part of the critique, I won't say much, as I can't speak German and I don't know if what is written on the book is related to the picture (and the key and the clock and the leaves...). But what stroke me about this picture, is actually your composition. I do think it's really interesting, since usually thinking "I'm not mainstream, I'll take the picture from a strange angle, adding lots of bokeh etc etc" it's getting these kind of pictures really..boring. In my humble opinion. But in your case, this "Academic" point of view, the position and direction of the lines, are chosen in a very balanced way. It's nice how the center of the book where the pages spread is creating this oblique line, perpendicular to the text lines, giving a big contrast to the smooth and organic curves of the subject.
So, as far as I can tell, good photography here. Not my genre, maybe, bust still a joy for the eyes.