Your pictures has to be 250K or less in size. You should make it about 800x600 compressed it using JPG to medium quality and just attach the files to your note. However, this forum does not allow you to attach more than one image per article. So if you have more than one picture, just reply and add again.
If you have a access to a server, you can throw your pictures on that and just link the image on your thread. You can can post as many pictures are you want.
Just remember to compress it and keep the file small. That's all!