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Are you speaking about the avatar? The avatar is what would appear below your username when viewing your posts. This is not the same as the Profile Picture (which you appear to have).
Make sure the image complies with the restrictions noted, otherwise it may fail to upload.
If you're speaking of the signature, which displays at the bottom of a user's post, which you do show a signature on your account, you will need to manually select the "Show Signature" option whenever you want your signature to post to your message. This was a decision made by Administration to help reduce repetitive signature usage - especially in the same thread.
Are you perhaps talking about your signature pic? Your signature with pic does not automatically appear when you post. You must select the option to have it show when you post. Also, moderators have asked that you post your signature a maximum of once per thread.