I like the lines following through from positive to negative at the rear but the front is bugging me a little. Maybe I'm just being OCD but I like seeing the radius of the chain guard centered with the BB.
It does look good as it is though, just a minor observation.
I agree, could definitely benefit from some tweaking up front. Tipping it up a little, pulling the whole guard back a bit and reshape the opening might help. Something I need to look at more closely.