<section>
  <img src="" alt="">
</section>
<footer>
  <img src="" alt="">
</footer>

section {
  border-bottom: 5px solid gray;
}
img {
  display: block;
  height: 100px;
  width: 100px;
  background: gray;
  border: 1px solid red;
}
@media (min-width: 1001px) {
  footer img {
    display: none;
  }
}
@media (max-width: 1000px) {
  section img {
    display: none;
  }
}