The illustration for the 3rd chapter of the Notable Missourian book on William Clark shows Clark on his return from searching for a Northwest Passage to the Pacific.
The final art shows Clark taking notes while passing through the Yellowstone region (He didn't see any of the geothermal stuff)
Rough of final art
Here's an alternate rough showing Lewis and Clark returning successfully to St Louis.
Another rough showing Lewis and Clark's return to St Louis from a different POV.
This alternate rough shows the discovery crew quickly rowing with the river current and starting to pass signs they've re-entered civilization, such as a flatboat heading up-river. As one can imagine, the return trip going with the river current went much much MUCH faster than the outbound trip where they had to fight against the current all the way to the mountains of Montana.