Yes, you can. If you, as the form author, wish to add images to the body of the form, use the Image item type. To allow form recipients to upload images as part of the form submission, use the File Attachment item type. You can either use a single File Attachment field that allows the use to select multiple files, or add multiple File Attachment fields.
Note that the File Attachment field is not supported when distributing the form as a PDF.