Kasen from Touken Ranbu

When I draw a character for the first time, I tend to reference a lot of materials, so I'm usually better at capturing their likeness compared to my usual work. And this time too, I'm running into a lot of difficulties. Procreate's brush strokes are cool, and I want to preserve them as much as possible, so I start with a canvas size of around 3000x3000 and then crop it according to the composition. This makes the data incredibly heavy every time. Ibis Paint, which I use for rough drafts, keeps crashing. There's also the issue with colors. When viewed on my smartphone, the saturation is low, but when I transfer the data to my iPad, it becomes very vibrant. Which one is the true color? I thought it might be an issue with the smartphone's color settings, and I found there were Natural and Vivid modes. The Vivid mode might be similar to the iPad's color tone. However, when I actually upload it online, not everyone uses the same smartphone settings, so it's a shame to think that the wonderful colors I see on my phone won't be shared.