I can suggest you to use ImageView instead of ImageButton and catch its onClick(). And you can use this xml file to give it a fine black rounded edges outline to your image.
I'm currently working on a soundboard and I ran into the same issue. Then I realized that it doesn't have to be an "imagebutton" for you to be able to use it like a button. Now i'm just using imageview and then using onclick.
As for the aesthetics of the black line I don't know but my images have rounded corners because I brought the images in by creating icons under new/other/android icons. It automatically makes one in each diff size category. Hope it helps!
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.