Images can be inserted while composing a message in Gmail on the internet. From your Gmail account,you must access Google Docs. Then, through the Import button on Docs , the image must be imported from the hard disk. Once the image is saved, it becomes a part of the private collection of the documents and can be copy pasted in the mail message easily. The images are stored in a personal collection so they can be used again.
With your Gmail account you can also access Google Docs. In Google Docs, use the Import button to search your hard drive for the files you wish to use. Once you have imported these files, view them in google docs and click Copy. You can then paste this into an email.
Now your files are hosted on Google Docs for you to use again and again.