Here are some
guidelines for General portrait editing.
I've been addressed by
Jabberwock to use paint.net program.
download it from:
http://paint.net/
Notes:
paint.net is a freeware program.
Jabberwock is an experienced AACW General portraits editor: his works are available from AACW forums.
Now some routine-indications.
You can windows paint for editing, although paint.NET is an improved tool, and so it's recommended.
-
Get the portrait.
You can design it ex-novo or rework a paint, picture or photo downloaded from the net.
Apply the default light brown/kaki background.
Save it as, or convert it to PNG file.
-
Resize the portrait to 81x81 PNG, if needed.
Use XnView or paint.NET to that aim.
With paint.NET look for resizing options under Image drop down menu, (CTRL+R)
-
Creating the external transparent layer
It's quite simple indeed

.......Once you have catched the way!
Start with the 81x81 PNG portrait over light brown/kaki background uploaded into paint.NET program
In paint.NET instruments table, (as default, up left corner) select elliptic selector/drawer.
1. Draw, the ellipse around your portrait-image.
2. Go to Modify drop down menu, and activate "reverse selection", (CTRL+I).
3. Into Modify drop down menu enable "cut", (CTRL+X).
Execute 1, 2, 3, in straight order without any other command or mouse click in the middle!!!!!!!
Here we are!
Probably you have till to refine some details nearby ellipse inner border using !
paint.NET paint and colours table.
REMERBER TO SAVE YOUR WORKS!

Enjoy!