hornsea inks looks just how I would expect an ink shop to look. it looks local and inexpensive, i would expect a personal, not neccesarily proffesional service from a site like this.
I also looked at it and went "omg not comic sans again!" but it doesnt matter too much, I actually think, despite having a lot of flaws that some of these work in its favour of appearing like a local business site, which i personally feel has a lot going for it.
the main thing for me is you give the phone number nice and big on the home page, and its easy to navigate to the cartridge i would be looking for.
personally for this site I would focus more on
seo, getting links on local university websites or thier facebook groups and writing about it in the local gumtree forum etc.
as for sharpink, i really didnt even want to click past the first page, i dont like how dark it is, and its not nearly as informative as hornsea inks. yet for some reson seems to have more links going to it!?!