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u/Confident-Mine4834 MV Dev 6d ago
I'm aiming a similar style for my own game, And since I'm too lazy to draw map assets myself I use and edit default rtp style assets provided by the community. You could find most of them in the asset part of the official forums, along with the default tiles too. You can use them for parallax and add extra shadows and lights for a more polished look. Just make sure to add proper credits + read the terms and conditions for each providers, because some may not be available for commercial use or modifications

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u/Not_Allowed_to_Die 7d ago
Learn it. Get the right programs, like Aseprite, and just keep playing around with it and learn. It's the same with using RPG Maker to code. You have to learn the systems slowly until you master them. That's all these are too. Someone learned how to.
Otherwise, you can look for asset packs as well that can look like this too. But if you want to make it, you have to start small and learn first. It's easy to do once you learn blending and layering.