Hi Pauline,
The documents do seem low resolution and I'm in the process of finding out for you if higher resolution ones exist.
As far as I can tell one reads:
St James's Cemetery, Liverpool 15th October 1876
Received for the interment of Mrs Hannah Penrith in Private Grave No. 1552 (A?), the sum of one pound.

And the other:
Mrs Penrith, Liverpool, 31st January 1877
A Head Stone for Private Grave no 1552 (A?) £3
Engraving 116 Capital Letters in stone, at 2d each: 19s 4d
Engraving 191 Small letters in stone at 1d each: 15s 11d
Painting 307 Letters at 1d each: 12s 9d
Total: £5 8d
I can't read that final line either I'm afraid.

There are 2 Hanna(h) Penriths listed in the database (http://stjamescemetery.co.uk/database), one buried in 1876 (age 67). No area for the stone is listed which means it was likely removed in the 1960s. My main mission at the moment is finding a map of the cemetery depicting the regions and grave numbers as they were. If one exists, and I can get hold of a copy, I would be able to tell you more specifically where in the site the grave is, despite there no longer being a headstone.

I'll email you if I find out anything further!