Hi Kory,
Yes, 150 kilobytes is the size limit. If you don't already have one, there are a number of free photo editors on line- I like IrfanView (
http://www.irfanview.com/).
Generally what I do is crop the picture and then resize it. Most programs have some presets, like 800x600 or 640x480, both of which will usually get you something < 150k.