It might depend on your artwork. If it is a bitmap image like a png , gif, for jpeg, it could have different levels of color/gray. This is called a gradient. Depending on what you select for the engraving, that can make a difference, especially if you use vary power in the engraving setup. And if your design contains very small bits of an image, depending on how many lines per inch you engrave, you get finer detail.
And as to replying to all, you can highlight the post you want to respond to and the “quote” function will come up. That will start a reply post and link to what you are replying to. You can reply to multiple posts this way. Easier on a device with a mouse or touchpad, a bit harder on a tablet, and harder still on a phone to select what you want.
As to making the camera see clearer, might not at all, but what it will do is allow you to place the designs more accurately in relation to the lid camera image.
Also, don’t forget that if you have a 20x12 design art board for your project, the design will always end up where you want it on the entire bed. That can be helpful with jigs and repeating things.