.row {
  display: flex;
  flex-wrap: wrap;
  padding: 0 4px;
}

.column {
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.column img {
  margin-top: 8px;
  vertical-align: middle;
  width: 100%;
}

@media screen and (max-width: 800px) {
  .column {
    flex: 50%;
    max-width: 50%;
  }
}

@media screen and (max-width: 600px) {
  .column {
    flex: 100%;
    max-width: 100%;
  }
}
<div class="row">
  <div class="column">
    <img src="Photies/BinocularMewLighthouse.jpeg">
    <img src="Photies/Blossoms.jpeg">
    <img src="Photies/Blackthorn.jpeg">
    <img src="Photies/FirewheelTree.jpeg">
    <img src="Photies/KittiwakeOnWater.jpeg">
    <img src="mist.jpg">
    <img src="paris.jpg">
  </div>
  <div class="column">
    <img src="underwater.jpg">
    <img src="ocean.jpg">
    <img src="wedding.jpg">
    <img src="mountainskies.jpg">
    <img src="rocks.jpg">
    <img src="underwater.jpg">
  </div>
  <div class="column">
    <img src="wedding.jpg">
    <img src="rocks.jpg">
    <img src="falls2.jpg">
    <img src="paris.jpg">
    <img src="nature.jpg">
    <img src="mist.jpg">
    <img src="paris.jpg">
  </div>
  <div class="column">
    <img src="underwater.jpg">
    <img src="ocean.jpg">
    <img src="wedding.jpg">
    <img src="mountainskies.jpg">
    <img src="rocks.jpg">
    <img src="underwater.jpg">
  </div>
</div>