Next target is South Ronaldsay island. You can get there by car via famous Churchill Barriers. South end of the island and you could see Lother Rock light:

and Muckle Skerry lighthouse (this is already not Orkney - Pentland Skerries)

Well, that's all you could get on Mainland. For next ones you need to take some ferries.
Ferry Houton - Lyness (which on the Hoy Island) crosses Scapa Flow and shows you Cava lighthouse:

And a bit far away Barrel of Butter lighthouse:

Also from Lyness you could see Cantick Head lighthouse, but maybe you'll have a chance to make better photo if you travel south on the Hoy island:

Ferry from Kirkwall to Shapinsay passes by Thieves Holm light (just outside of Kirkwall harbour)

and Helliar Holm lighthouse

Ferry Kirkwall - Stronsay comes near small Papa Stronsay light

Calf Sound lighthouse stays aside of regular ferry routes. I was lucky to get it - there was unusial ferry Stronsay - Westray, which came near it:

And the last in this trip brilliant Noup Head lighthouse located at the north tip of Westray island:

That was definitely not all Orkney's lighthouses, so i kept some of them maybe for next visit :)