Ok, i've big problems understanding TN's handwriting.
the second line says "Na uroki 27 maja 1916" - At lesson on 27th May 1916.
I've pronblems with the very first wor, but its seems to me "Risunok", drawing. Then initials. Maybe a I (?) then K, T, N.
Tn could stay for Tatjana Nikolaevna, of course, but I(?) and K i don't know.
So something like
Drawing - I.K.T.N
At lesson 27th May 1916
But if someone understands it better, i would be happy to know the truth, LOL