if there is one thing I love about SJA is how it manages to recycle elements from either DoctorWho or earliers into the plot, to save on budget, for example this week we are treated to the return of the "International Gallery" and Plant of the Dead was refrenced, which actually asks the questions of how did the gallery after having lost one priceless object ever get the Mona Lisa. Also I understand there is some history between the Doctor & Mona Lisa I hope that is touched on at some point, or Classic Who fans are going to go crazy. However know ive typed it maybe they shouldnt clear that up, just for the comedy value.
After the lack of K9 last week I was disappointed that he didn't feature in this episode.
I quite like the fact that it was Sarah Jane lite, however Cylde is fast (or may have already) replaced Luke as my favourite character, getting a map (until its needed) may not be how the Doctor does something, but its still a smart thing to do.
Moving on to the Mona Lisa herself, ive never been really keen on "people trapped in paintings" episodes, and I did not like how they wrote Mona Lisa, but really its not like we know anything about the real Mona Lisa to compare with.