I remind you that i’m not professional and i’m just sharing what I have learned. If you don’t want to use this method, it’s up to you 
1. Let’s start. First open you’re picture that you wanted to have inner shadow in The Gimp.
2. Select the image like so:
3. Grow for 1px
4. Create a new layer in transparency.
5. Select the new layer and fill it with black using Bucket Fill Tool.
6. Move the “new layer” at the bottom of “background” like this:
7. Shrink the selection to 8px or depending on how big you want your inner shadow to be.
8. Invert your selection.
9. Select > Feather
10. Write 20.000
11. Select the erase tool.
12. Erase the edges like so:
13. Select > None.
Finish Product:
If you didn’t understand or followed what i’m saying, feel free to ask me
Hope that I helped
can u add a picture in a sphere
If this is a question, then yes you can add a picture in a sphere.
IF this is a request, then I would try to do it if I’ve got the time
Thank you