Hey Joel,
Are you looking to use this for display purposes or would you like to interact with the data?
If you have static symbology or your hillshade, consider publishing a raster tile service (tile service in ArcGIS Online)
If you want to change the look of the symbology and still not access the data, consider a vector tile service.
If you need access to the data and the ability to perform analytics, you'll need to publish an image service to ArcGIS Enterprise.
Thanks,
Kelly