Alt image descriptions - too many?
I use the Yoast plug in and it alerts me if I am on the edge of a black hat issue. My site is about houseplants and I try to post several pictures depicting the plants being described. For some, this might be 12 or more images a post. And they all do directly relate to the keyword phrase, of course. However, if I use the alt desc of the KW phrase, Yoast warns me that it might be too many. The warning is to avoid being penalized by Google ranking. So, I'm wondering if it's best to follow the Yoast guidelines for that and avoid possible penalty, even if it's valid. After all, the ranking is done by an algorithm so it's not like I can explain it to Google.