To add to the excellent benhur767 explanation, if in Photoshop Elements you select File, New, Blank File, that New dialog box gives you the option to "Save Preset." If in the New dialog box you select the resolution and image size (in inches or pixels) and change the name to something like "duplex horizontal for printing", then hit "save preset", those settings will always be available with that name from the expandable menu "Document Type" in the New dialog box. You could set up different presets for websites or prints.
Just an opinion not based on scientific research but I would place your current photos in the top 5% when it comes to all ancients posted on CT. I do prefer black backgrounds but I dislike fake reflections so a nice white background with a few too many black flecks is perfectly acceptable. Unlike so many we see, it looks like you paid attention to where the highlights fell and gave us a color that is believable. Thank you and keep up the good work.
I use paint on a desktop but lately I’ve been using a free app called FrameMagic on my iPhone and I love. Very easy.
How about Mac users (No windows, so no Paint) that don't want to pay for Photoshop? Anyone have have any recommendations there? Thanks!