Honestly, this poem is not really to my taste, but bearing that in mind there are still a few issues I have with it that I don't think come from bias. My main problem with it is a lack of expansion. For a poem that is willing to descend into the depths of Hades, the poem is pretty scant on imagery and elaboration.
"Beauty is now in morbid visage
seen through dark soul veil."
This is what I would imagine would make a great theme for the poem, but you kind of want the reader to do the work for you. Do you want me to see my ideas of beauty through dark soul veil?
A lot of the things mentioned in this poem are hard to envisage on their own, such as soul, laughter, joy and passion. The poet I suppose will link these with imagery and metaphor, but those you've chosen are things like sun, dark clouds, shadows and spring. Hardly on new ground here are we? This seems like a practice poem, probably in the vein of one of the Romantics. As a practice poem it is well written, the rhymes and simplicity are pleasing to the reader, and some of the connections made are interesting. Mainly the position of the writer in Hades, the descent captured in tone rather than dense imagery is a strength of the poem but I don't really feel like you've done enough. You could make this more than pastiche, or even just better pastiche.
The length of the poem is a problem, as I say it is technically well written, but in terms of the content we seem to get to the end a little too quickly. A few more stanzas or possibly an alternate form altogether may have helped this come across stronger. Hades is a little to transient for my liking.
Your work is soundly written. You obviously know what you are doing. But you should honestly ask yourself are you being lazy?
I would struggle to write with as much clarity as you do, or to keep consistent meters and write rhymes that don't stick out as you have here. I also have the feeling that this poem would read very well aloud. All good things, all strengths to be admired.
You are however, being incredibly safe with your content and ungenerous in your development of themes.