just checked the Control Panel settings and the individual file size limit is 512kb. You may need to resize your images. .png tend to be large formats, .jpg only need to be ‘medium’ quality to display fine on screen.
Use an online image resizer to make them 800 px wide and they should be ok
Here is a free online image resize tool: http://www.picresize.com/ there are lots of others if you Google for them or if you have MS office you could use the inbuilt Image Manager
Anonymous