Oooo! I really adore the whole Yggdrasil concept, and this is pretty much how I'd pictured it (OK maybe something with at stouter trunk) extending up into the swirling misty heavens and the great unknown.
I really like the way you've captured the loneliness in this tree. Melancholic mood, given by the colours, although a white, lighty background (looks like hope or something ). Although kinda centered, it doesn't look 'cliche', which makes it very interesting! Good job Keep it up!
I hung on that windy tree for nine nights wounded by my own spear.
I hung to that tree, and no one knows where it is rooted.
None gave me food. None gave me drink. Into the abyss I stared
until I spied the runes. I seized them up, and, howling, fell.