Quote Originally Posted by Luccan View Post
Sune cares about pretty things, pretty people, and outward displays of love more than any genuine feelings beyond physical attraction. She doesn't seem concerned with much else and rejects the less aesthetically pleasant outright.
I don't think that's quite right. Looking at the 3e FRCS and Faiths and Pantheons her description says one should, rather than rejecting the physically homely, assisting them to become as beautiful as they can and actively strive to build friendship or admiration even with those you are unable to love.

Overall though, you're absolutely right that she doesn't come across as a good deity.
Reading the 'dogma' section you've got
"Beauty is more than skin deep. It issues from the core of one's being and reveals one's true face to the world, fair or foul". I find it hard to read that as anything other than a justification of the halo effect - the testimony of the beautiful maiden is worth more than the ugly old man because her physical attractiveness is indicative of moral righteousness.
and
"Love none more than yourself, except Sune" - That is RAW counter to the PHB definition of Good ("Good implies altruism...make personal sacrifices to help others..."

That being said, it's not hard to make her a clear CG deity.
Scrub out that line about "love none more than yourself" and replace it with something like "love the world and its inhabitants as yourself". Ultimately good is about helping others but a lot of her dogma seems to focus purely on encouraging her followers to maximise their own personal enjoyment of life - that's what makes her come across as CN.
Emphasise the aspects of her faith which talk about making the world a better place. About building a magnificent temples or carving a beautiful sculptures and so on not for profit or self-aggrandizement but as your little contribution toward making the world a more beautiful place - bring beauty into the world for the sake of the pleasure it brings those around you (although that is not to say you shouldn't enjoy it yourself - one can be Good without being a joyless puritan).
Do what you can to foster the pleasure and joy of others. Help them find passion in their life. Seek to provide unselfish love to those around you, especially the lonely or the suffering. Protect what is beautiful and bring more beauty into the world.