Tin and Oregonian, I suppose it’s mostly the specific terms that you don’t understand in German.
I’ve tried to translate them in English.
If there is something not understandable please look at the video tut, pictures can tell a lot sometimes.
groni g, I hope you’re not offended by it. I made this tut many times in English already.
open your image and add an alpha chanel if there isn't one
duplicate the image
filters >> distorts >> whirl and pinch
with these settings
filters >> distorts >> apply lens
make surroundings transparent
lens refraction index 2,20
layers >> scale layer
uncheck the chain and make the layer square (I made 310x310)
layer >> transform >> rotate 180°
layer >> scale layer to image size
alpha to selection
select >> invert
filters >> light and shadow >> drop shadow
blur radius about 1/3 or a bit more the globe size
uncheck allow resizing
select >> none
dropshadow layer >> layer to image size
colors >> colorize
new transparent layer
alpha to selection on sphere layer
highlight te new layer
gradient >> white to transparent >> shape >> shaped spherical
apply the gradient like in the video-tut
select >> none
layermode >> overlay
new tranparent layer
use the ellips tool to draw an ellips
gradient shape on linear
draw a line >> layermode >> grain merge
all layers to image size
I suppose you can understand how to make the new star-brush.
How to move the sphere you can see on the video- tutorial.