All of Sarah Waters' books are utter gems in my opinion, ditto 'Oranges are not the only Fruit' by Jeanette Winterson. It took me a while to bring these to mind though because their characters are just like any other to me in the sense that they're individuals with their own quirks just like any other protag in a novel, it's not their sexuality that defines them.
Also, a little off piste, but I'm enjoying Gentleman Jack too - great story, amazing script, wonderfully acted (I haven't read any of the books which it's based on though).
I agree with Yvonne - I'd be extremely careful when writing an LGBTQ+ into my stories, but then I'd also be careful if I was writing from the POV of a man too or an Asian woman, or a child, for example. Some of the lines and boundaries are very thin and we take a risk when we open our writing up to anyone.