Hmmm. Try decorating it with flowers and stuff like most players do. Everytime someone invites me to their gh, all I see is a ****loads of flowers with a pattern. Their house looks pretty simple but I really like it. Maybe try upgrading your house with flowers garden and such? All I see on the first and third pictures, all the way left is an empty area with grass. Maybe try adding something there? Like flowers like I just recommended you to? Or add some close friend's statue? Statues can look really nice. Or some hats displays, or loots cases. Those would make a great decoration to your gh.
Man! Where is Shadowfox when we need her?! She's an expert at guild house decorations.