Actually, there are general naming rules for the grid-styled images. However, for anything that isn't "grid" styled (16x16 icon, 32x32 icon and 64x64/150x150... see Forum:Images for the yet-to-be-responded to image standardization conversation)
I do suggest naming pictures to what they were originally intended for, in my naming methodology for the biome images i started the file with the biome name, hyphen, then what the image was about with that biome. Attempting to use as few words as possible since the name of the file isn't meant to be entirely descriptive but is to give a general idea of it.
Hey Notchhead, love that you're adding images to pages, however please use the Block or Item template to add the image to if its the only image on the page and displays the item/block fairly clearly. You can do this using the "image" argument of it. In source editor this can be done by adding the following:
Where the File Name.ext is the name of the file uploaded.
Took a look at a few of your edits on this. Indeed you're getting the images into the template just fine it looks like! I will mention however that day-shots are most preferred when it comes to images as it'll be easier to see and can show more detail than night shots. The few exceptions to day shots I can see are for items/blocks/mob that do not appear correctly during the day and only "function" at night. (Such as the Light Sensor being in the off state could never be found in a true day shot)