Always problems with pictures displaying during WordPress migration.So bad?!?

I have two independent websites, using two different themes, both with WordPress. When each time I migrate the website to other web space, always failed to display correctly pictures of products. My step as below: (the WordPress official steps have been tried):
1. backup original MySQL database;
2. replaces all old websites address in database with “SRC” software to the new website; 3. downloads all old site’s files;
4. import MySQL database in new web space;
5. uploads all files to new web space
6. Change old database datas in wordpress.config to new web site’s data.
I like WordPress very much, but since too much hard works and fails during wordpress website migration, I am exhausted. I’m losing to trust WordPress again. Just hope WordPress do not make us thoroughly disappointed!