RAYtrospective

I've got with me a set of about 50 ORIGINAL character sketches by an Academy award winning director.These include concept sketches for films like charulata , aparajito etc. (I couldn't identify the rest , yes Very UNCULTURED ) My father got them decades ago from his makeup artist , who was also my father's uncle/relative. Bit of an unusual yet very personal post this one , Since my father passed away these have been stored away ever since.

I’m wondering if these sketches might be of value today — either to collectors, institutions, or anyone interested in Ray’s legacy If yes whats the process of authentication here ?