What is this red dot?

What I am doing wrong with the Diana F+ to get a shot like this?

Photographer:

peachy92

Uploaded:

2016-06-05

Tags:

120 120film 120n 2016 diana dianaf loveletters unitedstates us usa

Camera:

Lomography Diana F+ Love Letters (available in our shop)

Country/region:

United States

Albums:

Diana F+

• #030102
• #fa2819
• #30505e
• #738c99
• #911610
• #b8c7cc