I’m doing Math HL, Physics SL and History SL Watch
My others subjects:
English B HL (easy for me)
French B HL (easy)
Portuguese A Literature SL
PS: I’m Brazilian, so I might have done some English mistakes...
In the UK art (typically to A-level/IB HL) is usually strongly recommended and sometimes required, as most architecture courses here require the submission of a creative portfolio; while it's possible to create this without doing art in 6th form, usually those taking art will use part of their work for the course in their portfolio (thus lowering their overall workload - which for IB is quite significant).
If you were applying to universities outside of the UK I can't advise though.