What had you envisaged? Maybe we can offer some suggestions if we know what you'd like to achieve.😊
What about one good healthy flowering shrub in the bay window?
Rather than pots I'd consider evergreen shrubs.I'd also consider a Pyracantha near your front window - they're not in vogue ATM but I think one would suit that space.I don't know your soil conditions but even so both will most likely suffer from moisture deficiencies - a rain shadow near the wall and that tree will suck up a lot of water.Rather than list a selection, have a play with the RHS plant finder and narrow down a few you like. It's quite a handy tool. https://www.rhs.org.uk/Plants/Search-Form