HGV Licence and medical renewal

Help help.
My driver licence (C+E) is due for renewal in Oct. The renewal is for both my 45 medical and photocard expiry. As reading and writing aren’t my best bits I am asking for help!
I’ve booked my medical next week using doctors on wheels.
I’ve got the D2 green form and D4 pink medical form.
To fill in the D2 do I tick the licence renewal?
Do I have to send in a new picture or can I use my passport as it’s valid for another year.?
Please help as I struggling a bit.
Many thanks