<div class='galery'>
  <div>
    <img src='' />
    <img src='' />
    <img src='' class='img2' />
    <img src='' />
    <img src='' class='img3'/>
    <img src='' />
  </div>
</div>

.galery{
  display: block;
}
.galery div{
  display: inline-block;
  border: solid 1px gray;
  margin 10px;
}
.galery div img{
  width: 400px;
  height: 200px;
}
.img2{
  width: 500px!important;
}
.img3{
  width: 200px!important;
}