Kim, this game (as you have probably already found out) is very picky about doing things. Here is a quote from one of the walkthroughs at GameBoomers, which gives the conversations necessary: SPOILER
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Holmes gets business card
LOOK business card - phone number listed
LOOK portraits
LOOK camera
LOOK Hargrove
SHOW photograph from Pratt's room to Hargrove - Lt Basingstoke, died in Suez made 10 copies
TALK Hargrove
1 'my name is Holmes'
2 'did Basinstoke reveal'
2 'I saw the portrait' - he uses bromides
4 'Most studios now use ' - cyanide can be used as a fixative
2 'duplicate negatives'
3 'I believe I've happened upon' - let's go in back
DRAW curtain