Image push to dockerHub
You need to tag your docker image
docker image tag <image_name>:<tag> <DockerHub_username>/<image_name>:<tag>
Now Image push to dockerHub
docker push <DockerHub_username>/<image_name>:<tag>
Example:
docker image tag two-tier-app:latest hemantjangir/two-tier-app:latest
docker push hemantjangir/two-tier-app:latest
Here you can see the docker image successfully push to dockerhub.