Do include a photograph of your self with your first letter. If you have children, it's our recommendation that you send their photo in the second or third letter. This gives her a chance to consider you alone and not feel pressured to become an instant mother. Chances are that you don't take your children along on a first date either. Professional photos are not necessary.
Snapshots are fine so long as they are clear.
A nice warm smile is also a plus. Do be patient. International Air Mail delivery times will vary from country to country. A lady in the Philippines will generally receive your letter in 5 to 7 days. Hong Kong usually takes only 4 days while Indonesia is 7 to 9 days.