if you want to make it more realistic, use gimps layer modes to add some effects (one really cool thing is: copy the layer, put it into hard-light mode and then apply some blur on it. this is usefull to create the effect of reflections of the air
Thank you so much for the advice. I've not used blender much for a long time. I'm gonna make this again after my exams, and I'll also do some post-pro with gimp. I think it'll be better this time.
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Grvrulz
The pathway to eternity
Bisigi Project is coming back [link]