Few Important Points to attract your target list and make more open rates:
1) Add relevant content and most important titles should be in H1 Tags
2) Check or add Image Alt text's. Don't add higher resolution images in email template.
3) Keep CTA links in Top header section.
4) Avoid Email Id's in header or body section. Better to have it in footer section.
5) Get the Subject line Right
6) Keep Tracking parameters for the CTA link. It will be helpful for the reporting.