I haven't listened to enough of Kurt Cobain's music to critique the artwork from that viewpoint. I'm familiar with "All Apologies" and a couple of Nirvana's other big hits, but that's all. I suppose the dark tones of the painting coordinates nicely with the flat-tuning for which they are known.
Portions of your artwork, though are definitely fascinating. I love the detail half-way down the left side, which reminds me of green shrubs/trees reaching up into a sunset sky with the Moon hanging there. And the detail from lower left looks like a pathway lined by trees with autumn colors! Very pretty! 
Its so nice to respond to a sad post of life and languishing in one interpretation above then to this one! which is like a English spring moring with all the first experiances and naive possibilities one has in there heart with youth. thank you thekittygirl x
Thank you! thekittygirl great to get your interpretation on my latest art post called "Government"
With love,
harj