@ Luis - that's the best way to look at it.

Is there a woman in the picture?  No.  

Are the boots designed for a woman, and does that matter in a search?  Yes.

Therefore they would be specifically owned by a woman and 'woman's' boots tells us which gender would own them.  

(Possessive noun - if it helps at all, see here for more http://www.rhlschool.com/eng3n9.htm)  

As Duncan and Colette said, you could also say 'lady's'  (or the plurals: 'ladies'' or 'women's').  It's about expressing which gender they belong to, without unintentionally misleading the buyer to believe there's a woman in the picture.

I hope that helps a little more.

Congratulations on your English certificate!  I used to do well in French and Spanish at school, but would be completely lost now due to lack of practice.  I wouldn't have a hope of being in this business in any other language than my own - so I think all the non-native English speakers who are not only participating, but making money at it are just amazing!  

I understand.  I tend to be quite sparse and very specific in keywording, and possibly I miss out on some searches that I don't anticipate... and I think what you're saying is fine, as long as you don't end up being rejected on those keywords.  I'm just trying to help you understand the reason for your last rejection, so that you don't have the same problem in future.