Do I need to put the same captions under the same type of images?

Question

Search Engine Optimization

On the one hand, the photo frames the text with the one directly related to the photo, on the other hand, it becomes spammy, since the signature is like plain text.
In code it looks like this

<div class="caption">

<div class="image-caption">Рассвет с палубы корабля. Costa.</div>


<a class="pageLink next" style="display:none; opacity:0; cursor: default;" href="#" title="Next Page"></a>

</div>

</li>

<li><a class="thumb" href="http://selftrips.ru/wp-content/uplo...ine-den-91-gorod-mechta/DSC01389-1024x682.jpg" title="DSC01389" >
<img src="http://selftrips.ru/wp-content/uplo...shine-den-91-gorod-mechta/DSC01389-100x75.jpg" alt="Рио-де-Жанейро, достопримечательности за два дня. День1." title="Рио-де-Жанейро, достопримечательности за два дня. День1." />
</a>

<div class="caption">

<div class="image-caption">Рассвет с палубы корабля. Costa.</div>


<a class="pageLink next" style="display:none; opacity:0; cursor: default;" href="#" title="Next Page"></a>

</div>

</li>

<li><a class="thumb" href="http://selftrips.ru/wp-content/uplo...ine-den-91-gorod-mechta/DSC01401-1024x682.jpg" title="DSC01401" >
<img src="http://selftrips.ru/wp-content/uplo...shine-den-91-gorod-mechta/DSC01401-100x75.jpg" alt="Рио-де-Жанейро, достопримечательности за два дня. День1." title="Рио-де-Жанейро, достопримечательности за два дня. День1." />
</a>

<div class="caption">

<div class="image-caption">Рассвет с палубы корабля. Costa.</div>

repeating text

<div class="image-caption">Рассвет с палубы корабля. Costa.</div>

But I sometimes have 10 photos and 20 with one signature.
Making "individual" signatures is not an option. Since all the same, even logically they will be very similar, on the other hand, it doesn’t make much sense, such as “the same thing but from the side”
Thank you.
Page Example

Answer 1

this is all important for those who use screen readers
if you do not care about those who do not see your sunrise from the side of the ship deck, then there is no point