Carto (https://carto.com/) is a only map site, but it can do more than just show map.
It can compare different map layer and produce the comparison result.
If you are a student, you can apply Github Education package (https://education.github.com/pack) then use Carto free.
Carto is easy to depict point, line and polygon like Photoshop. You can take a look at the example https://gwrx.carto.com/builder/5e17c799-8442-4582-b1d8-e4405b6051e2/embed .
I am an artist too, you can see more works in https://www.saatchiart.com/account/profile/160262
