The imiages you have need to be lass than 112kb in size.
If you need to d.load an image resizer use : >> this image re-sizer <<
(scroll down then click to d/load)
Once you have this , right click on the image you wanna post, select resize.
Then select the advanced option, then change the first size to 600, press entre and it should be a nice size pic and a small kb.