Gone For Ever
too presuming
The rosebud is guilty of presumption—assuming it will bloom. Rossetti treats optimism itself as a kind of moral failing.
chill damp consuming
Not just death but decomposition. The grave is wet and cold—Rossetti gives you the physical reality of burial.
Too fearless
The skylark's confidence is a character flaw. Notice the pattern: happiness equals hubris in this poem.
dame bird
Typo or archaic "same"? Either way, the specific bird and flower won't return—not just any replacements.