A read of
http://www.modelboatmayhem.co.uk/forum/index.php?topic=23.0should help. The maximum size is 600*480, 150Kb.
The first 2 images exceed this, bot in overall size on screen, and by file size. Reducing the image so that both dimensions are within limits should at the same time bring the file size within limits, and that should solve the problem. If I do a considerable write, before submitting I usually copy it, maybe even paste the text into notebook, so I can get it back if disaster strikes.
Hopefully someone can offer some useful help with the actual boat - it looks like it should restore into a really handsome sailer on anybody's water.