I was expecting comments about the image content itself...
It looks like you and your fried had much fun.
You could also add some traffic. For example a train with armored cars going in and out of the town.
There is this newgrf called Town Wall Objects. This would make the island look more serious (in the main game menu at the beginning NewGRF settings, then Check Online Content etc). Another set is VAST+Fences, as no serious facility goes without one.
There are so many options to get more fun out of such simple scenario. This is what make this game actually amazing.
Edit: Oh, to place the objects, you have to click on the landscaping tool (icon with forest and beach) and then on the transmitter icon (place an object, on the right)).
Edit 2: There is this cheat: ctrl+alt+c and you can set higher initial funds for your operation. Then you can install real factories. FIRS NewGRF would bring you different graphic options for them.