Both pictures look nice but neither captures the idea of solitude. Borrowing from what made in uterus and dave_baer have said, you’ll probably want to use cool colors and a landscape view. Show lots of empty space, especially in a courtyard or train station usually crowded with people but is now empty. In your first pic, the colors are warm and festive and there could be people just around the corner. In the second I feel cold but don’t know what’s around me.
Are you determined to make this a 1st person view or would you consider including the subject? If you put the subject in the picture you have the added option of body language and proximity. A person can find solitude or feel lonely even in a crowded space, especially if nobody is turned toward him and it can be depicted by hunched shoulders and a guarded position. Also, since solitude can be either a good or a bad thing, decide if the person is enjoying his time alone (reading a book?) or hates it (homeless person muttering to himself).


