Hey mate, you might want to shorten every Blue wire you've got running there. Each wire is showing a bit too much copper and could be causing a potential short. Desolder those wires, cut a few millimeters off of them, and resolder them back to their respective pads. You only need a fraction of copper to be attached to the pads for it to form a reliable connection.
You also might want to touch up a few solder joints on both boards, don't mean to be rude, but those joints do look a little on the colder side.