Thank you for your attention, LittleStain!
I have found out that if I configure the project to "Use high-DPI Display" to "Yes", all images are perfect in the mobile as they are on PC, however the game get a lot slower because of that. I'm trying to understand how I can mix high-DPI Display with image files that will not be so heavy on the memory usage.
Actually, memory usage is still a little of a mistery to me. For example, after the layout loads an image, is there any away to get rid of that image in the memory usage without changing layouts or is it impossible?
I'm working on a Visual Novel, and worried about quality I'm using sprites as characters with a size of 1100px width and 1800 height (I have being reading about setting two different sprite groups - one for PC and one for mobile - and I'll try to learn more about that because it seems the fastest way to create a game to host in a site and to mobile devices as well).
Probably, if I can manage to make smaller character' images keeping a high definition, it would weight a lot less in the memory.
LittleStain, could you please tell me your best practices when you try to have detailed images and best performance as well?
Thanks again for your time!