The maximum allowable size of photos is 300K, although this takes time to download. We've found the best size is around 100-150k. This fills the screen without needing to use the sideways arrows below them.
The Photobucket way is easy on the size problem, as mentioned above, but the photos will disappear from Mayhem if the account is altered or closed.
Also, you do not see your photos in the preview. We advise you "post" and then look at the result. You then have up to 20 minutes to alter anything you want.
This is also a good time to run the spell checker if you're not sure of any words, as it saves us correcting it later. Some of the spelling is accidentally wrong and sometimes puts the whole thread on a different meaning.
Hope all this helps and leads to a smoother running forum for 2015.
Cheers and happy Boating.
ken