Scaling with art and Unity

Hey guys,

we're currently having some problems with the scaling.
Our current project is a 2D tilebased sidescroller with handdrawn HD graphics.
So we wondered what is the right scale in terms of Unity, art and the proption to each other.
Here are our questions:

1. Should a camera scale be the orignal size of a 1080p picture?
This is about the size of 5.4 with an orthograhpic camera.
And that would mean a image of an character which takes about 22% of the screens height should only be ~230px?
2. Should the images always be power of 2? Even if that creates a lot of white space within?
3. When you have a big rock and a small flower, should the image files already have the right proption too each other?
Even when the smaller image has a lot more details compared to it's size ingame?



Thank you very much!

 

A partial answer would be really helpfull too

 

Sorry, no idea I am just making all my images bigger as needed. Downsized images are looking ok in Unity, upsized images are uggly

something here ? https://forum.unity.com/threads/pixel-perfect-preview-package.533433/

2. You can create sprite atlas and drop all "wrong" sized images in it.

3. I think, yes - for "pixel perfect" looks.