Fantasy map drawing

[TrefoloGM]

Hello ENWorld! I have been getting more into drawing my own Fantasy world maps. Ive watched a few youtube tutorial videos by users such as Questing Beast and WASD20. My specific question though is how could i potentially draw a Caldera of a volcano slightly emerging from the ocean? I have a city, named Fjordnymrhia where the dwarves reside that is built inside of this Caldera. If anybody could help me out or point me to some good recources i would be quite grateful.

 

[pogre]

Check out this site:
cartographers guild

Tons of tutorials and really helpful people on their message boards.

 

[TrefoloGM]

Hopefully this worked but this is what ive just drawn. not too detailed but i think that is okay.