Try googling 'nebula tutorial deviantart' and see what you find it would be hard for me to make a tutorial since i don't really follow any particular method anymore, it just sort of happens
Thanks! A lot of the sharpness is from working at really large resolutions, my normal working res is 4000x3000. I didn't use a sharpen filter, I don't think [I don't usually] ... I just tend to resize stuff smaller to cram in the details.
Wonderful nebula with superlative lighting effects.
Best regards,
Michael C. Turner