The gallery is currently error-free so it may be a case of you having to replay his route unfortunately (sometimes the images simply need re-unlocking). Sorry about that! Let us know if you have any further issues.
Oh wait, how many CGs does Finn have? Because I have 9 in total, am I missing some? I ask since the 3 that are blocked are after the Ch. 10 CG so maybe they do not "exist"??