If I like the painter John Martin who else may i like

Zdzislaw Beksinski

Alexanderschlacht by Albrecht Altdorfer (1529)

Fuuuuuck this is awesome - I don’t have any further suggestions but I’d love to see what other people say!

Different paintings showing different stages of a city growing from a village to an imperial capital. From the 1830s

https://en.wikipedia.org/wiki/The_Course_of_Empire_(paintings)

The Caravan by Salvador Dali

Gustave Dore, i don't remember any with perspective as deep as these but I think he works on a similar sense of scale. Some of the illustrations from the Divine Comedy or Paradise Lost might be up your street

I’d check out Adolf Schaller’s work from Cosmos in the 70s. It’s always blown my mind.

https://www.planetary.org/articles/20131023-on-hunters-floaters-and-sinkers-from-cosmos

From a more modern take you’d probably love most of the concept artists from major sci-fi blockbusters. Christian Alzmann, Dylan Cole, Doug Chiang, Etc.

Most of the art department at ILM/Lucasfilm and Lightstorm are pretty big on sharing personal work that hits similar aesthetics.

Maybe William Blake?

What about it do you like? the realism, the landscape, or maybe both? Caspar David Friedrich was a great romantic landscape painter and John Singer Sargent was a great realistic portrait painter. both very very detailed but seems John Martin has more of an intensity and grandiose feel captured in this paintings.

Videogame artbooks. Personally I have the Skyrim and Elder Scrolls Online ones and they are right up this alley. Unfortunately I don't know where you'd be able to find them online, but I'm sure you can find something if you googled it.

I'm totally following this thread and looking up John Martin cause this stuff is awesome and I also would love to see more of it.

Try Gustave Courtois, William Adolphe, and my personal favorites Gustave Dorè and Franz Stuck.

This shit is amazing. I almost feel like he influenced Warhammer 40k. There's some incredible artists in that space who do sort of similar stuff but in a hyper violent sci fi setting

JMW Turner.

Painters from the Romantic period or with a Romantic influence, maybe. Here's Thomas Cole. He's from the Hudson River School, which someone else mentioned:

https://en.wikipedia.org/wiki/The_Course_of_Empire_(paintings)#/media/File:Cole_Thomas_The_Course_of_Empire_Destruction_1836.jpg

https://en.wikipedia.org/wiki/The_Course_of_Empire_(paintings)#/media/File:Cole_Thomas_The_Course_of_Empire_Desolation_1836.jpg

https://en.wikipedia.org/wiki/The_Voyage_of_Life#/media/File:Thomas_Cole_-_The_Voyage_of_Life_Old_Age,_1842_(National_Gallery_of_Art).jpg

https://en.wikipedia.org/wiki/List_of_paintings_by_Thomas_Cole#/media/File:Thomas_Cole_-_Expulsion._Moon_and_Firelight.jpg

A contemporary painter I think of is Mariusz Lewandowski:

https://www.lewandowski.art/userdata/public/gfx/00fe5a22a9ad07952357a4d12df6fb54.jpg

https://pbs.twimg.com/media/D-6c8gSU0AAgNM0.jpg

https://steemit.com/art/@alejandrodmarco/the-fantastic-paintings-of-mariusz-lewandowski

Dark Souls and the like (video games)

The Hudson river school

It seems to me like you like romantic landscape/war paintings

I think you may like Salvator Rosa, Theodore Gericault, or Claude Joseph Vernet

A little looser style but I get JM William Turner vibes

Giovanni Battista Piranesi

It seems kind of like you're looking for artworks with a mix of spectacle, scale and chaos. You should have a look through 'Artstation', there's a lot of really talented artists on there. Just search for thinks like 'Battle', 'Crusade', 'War', 'Ancient', 'City' etc. and filter by Digital 2D / Traditional 2D and you'll get a lot of results similar to what you're looking for.

Here are a couple that I found in 5 minutes of searching:

Here

Here

Here

Here

Here

Here

I hope this helped.

Malazan vibes

Maybe Hubert Robert?

Frank Frazzetta The Godfather of Fantasy Art

Any of Giovanni Battista Piranesi’s etchings. Jacob Geller talks about the book based on him, Piranesi by Susanna Clarke, in this video, and I highly recommend both it and the book.

Gustave Moreau

Marco Brambillia. He's the guy who did the music video for POWER by Kanye. I think he's pretty good.

The book A History of the World in 10½ Chapters by Julian Barnes.. in particular Chapter 5.

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from Wikipedia - A History of the World in 10½ Chapters by Julian Barnes published in 1989 is usually described as a novel, though it is actually a collection of subtly connected short stories, in different styles. Most are fictional but some are historical.

Chapter 5, "Shipwreck", is an analysis of Géricault's painting, The Raft of the Medusa. The first half narrates the historical events of the shipwreck and the survival of the crew members. The second half of the chapter analyses the painting itself. It describes Géricault's "softening" the impact of reality in order to preserve the aestheticism of the work, or to make the story of what happened more palatable.

https://noahbradley.com/

Arnold Böcklin maybe?

Ivan Aivazovsky

Hubert robert

The fire of rome hubert robert

Hey OP, could i trouble you for the name of the last painting shown, with the guy on the globe? Thanks

potentially Frazetta..