signature

So I wanted to know how to post big and clear pictures because I want calitiels to make me signature and she asked for bright, big and clear photos. I only know how to post the picture as a thumbnail, so any advice will be appreciated.

I will give the pictures to you guys and then you can make the signature. Please make a bright, pretty and cheerful signature and will like to have it in 2 days. I have two grey cockatiels. One male and other female. Female name: Honey Male name: Cookie.