<div class="container-fluid">
<div class="row first-block">
<div class="col-xs-12 col-sm-6 col-lg-3">
<img class="img-responsive" srс="http://elki.local/template/img/elka-first-block.png" alt="">
</div>
<div class="col-xs-12 col-sm-6 col-lg-3">
<img class="img-responsive" srс="http://placehold.it/700x400">
</div>
</div>
</div>