You can copy an image from a program like 'Paint' direct into the body of an email in Ezekia. Note that the file sizes allowed are quite small, and if you exceed these limits, you will not be able to send the email.
If you encounter problems with file sizes, you can open the image file with a paint program and resize the image to 50% or 75% of the original, without much loss to the image quality. Once you have done that, copy the image direct from Paint, and paste it into the email. You can then resize the picture there if necessary by dragging the corners.
It is also possible to add a link to any image using the 'chain link' icon.