a couple ways. Not sure what type of phone you have. If you can connect your phone to a computer with a data cable you can get access through "my computer" if it is a windows pc, not sure with mac. Most Apple computers use iTunes to manage files. When you use my computer you will see a new drive show up. Open it and look for a file that says photos or pictures. Look there first. If not there look for a media folder with picture folder in it. Another folder could be a dcim folder......... that is the hard way.....
I most smart phones are tide to an email account already. Open the picture, tap on it and you should see some icons show up and one is to share. Chose the email you use and send to your address of choice.
hope that helps....if not the make and model of the phone helps answer better...