Over the past couple of centuries, there has been a lot of skepticism with regards to the concept of ‘objective’ beauty.
I must admit that I myself am skeptical that there is (or could be) such a thing as objective beauty. In other words, beauty really is in the eye of the beholder. Do you think Mozart is better than AC/DC? Well, that’s just like your opinion, man. Do you think Megan Fox is more beautiful than Jennifer Aniston? Cool story, bro. One might object that we don’t act like beauty is merely a matter of opinion, however, this argument isn’t any more convincing than the person who says we don’t act like morality is subjective (or that we don’t “act” like money has subjective value).
What this means is that once can’t argue from objective beauty to God’s existence, since it plausibly doesn’t exist (or it isn’t a fact that it exists: not known to be true). However, perhaps one can still argue that our awareness of beauty is still expected on the God hypothesis. Whether or not that is the case, let’s grant for the sake of argument that objective beauty does exist and/or that our awareness of beauty is expected on the God hypothesis.
One immediate problem is that it’s not clear why objective beauty (or awareness of beauty) is surprising if God doesn’t exist. If it’s not, then one wonders why it would be expected if God does exist!
Secondly, it’s hard to see how one can say that beauty counts as evidence for God but then claim that ugliness doesn’t count as evidence against God. After all, if ugliness did not exist, one would have one less argument against the existence of God. Furthermore, it seems like beauty would be evidence against an evil god. If beauty is evidence against the existence of an evil god, then why on earth is ugliness not evidence against a good God?
Thirdly, saying that the existence of beauty in the actual world is evidence for God is obvious cherry picking of the data. If God really did exist, we would expect there to be much more beauty in the world (and different types of beauty). We also wouldn’t predict that there would be so much disagreement about beauty. I swear, Christian apologetics is all about leaving (contrary) evidence out!
Fourthly, there are obvious evolutionary reasons for our finding certain things to be beautiful. And as I have argued in the past, evolution is not expected under theism. 
 All that I have said here in this post can be applied to the claim that love is evidence for God.