Terrain Party and Bryce 7.1 Pro
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If you're on a tight budget (or no budget) and you think your landscapes could use a boost, Terrain Party could be of help. It is a web-based world map for which the view can be switched from Open Street Map (default) to USGS Shaded Relief (you could see mountain ranges). Though I would recommend to first find an area that you know have the terrain you want, zoom in a but and then switch your view options (it makes it a bit easier). Also, pay attention to the kilometers as the default is 18km, and it ranges from 8km to 60km depending on how big of an area you're looking for. It downloads 1081 x 1081 Height Maps in several formats. I usually use the "Merged" file as it seems to work best for my work.
Terrain Party (https://terrain.party/)
Bryce 7.1 Pro