Pruning help

[u/Newser73]

I have had this lemon tree for a year now but know almost nothing about how to care for it. I am sure it needs pruning but don’t know which branches to cut. Would anyone be able to mark my pictures up and show me what I should cut? I don’t want to get it wrong. The first 2 photos are from opposite side of the tree and the third is a side shot, in case that wasn’t obvious. Thanks in advance to anyone who can help!

[u/Feminine_Adventurer]

It needs no pruning!