Edit 1: She is not my grandmother

[Keith]

She is not my grandmother If you chose to open with this line, its a good opening that draws me in as a reader, but you woill need to change the title (Open casket)? you also wouldn't need to mention coffin later.
Painted face, alien face, eyes closed. Painted, alien face? eyes closed is too basic, think of a better way to describe this
A sickly sweet perfume traps me. I like this shift in the senses it adds a darker dimension.

Her lips dyed red I like how dyed can play on two levels,
to match my blood. this line doesnt work for me maybe delete and change the above line to 'Her lips dyed blood red'
I see my blurred face
staring in the coffin side. coffin is too obvious, give the reader credit we already know maybe think about reflections in brass handles or the sheene on the mahogany, your poem.

Lips flat, no loving smiling, the phrasing in this line is off  ( two ings ) and you have already covered lips, so try to show the reader something else.
she is not my grandmother. this should probably be your closing line circling back to the start
Roses bloom, yet eyes stay closed. I like the comparison of the flowers on the casket being vibrant in stark contrast to the image the reader is seeing between life and death.

Hi Rose
I like the intamacy of the poem and how it singles in on that moment which in itself is slightly macabre and I also like that feeling and statement of rejection you manage to put across. I think your word choices could improve and I also think you need to give the reader more to see through your images, consider a macro view and the details that only the N would notice in the painted face. I like the reflection and the smell. This is coming along nicely but I think you still have work to do. Best Keith