Thanks for your input. I read in the other thread your tip on this, and I have been watching some tutorials on the subject.
I have some questions if you have a little time. If I layer in Paint.NET and create a very large rendering, could this be considered enough once the photo is saved in the project format (PDN)? If an .ai format (or other vector format) is required, is it required simply as a matter of the broad use of the file type (convenience of universal compatibility), or is there actually a difference between a vectored image and, for example, the aforementioned layered Paint.NET .pdn type of file?
I have seen how vectoring can be useful for duplicating simple images with lines and so on, but this is a fairly complex image with difficult to reproduce gradation. Also, I have seen that I can simply press a button and create a vector image in Inkscape. Haven't tried it yet, but I plan to today. Especially if the layered .pdn is not enough, it would help tremendously to know if this simple vectoring process of the image is enough. It seems to me to basically accomplish the same thing as good layering does in the first place, but, if there is a difference, I will go ahead and vector the images, even though I do have the .pdn layered projects in hand already.