the thing is, the DPS will require evidence about the arrangements.
what evidence your LL can provide and what evidence you can provide about the arrangements. Was it via email?
When you asked the LL to paint after 1 year and the LL said you do it, is it written? How long after that was when you asked if you can paint the walls blue and the LL said you do it but you have to change it back when you leave?
Why are you still listening to that liar (the agent) who is telling you different things every time you meet?
When was your last email or written conversation about the things you listed with your LL?
The DPS will need some real evidence about arrangements and I am afraid will not take some emotional "I improved the house and it was crap when I moved in and I am pregnant and have kids" as a significant proof. Its only ok here on MN.
Also, changing your points (suddenly saying you asked your LL to paint and they said no you do it or paying half for the floor improvement) may not go well with the DPS.
I think your agent/director is mixing the messages. Why are you not dealing directly (via email so there is proof) with the LL?
Please, be calm and think about it reasonably. Make sure you have some evidence about your arrangements with the LL.
Otherwise, you can just offer the LL (not the lying agent) that you work out the blue walls painting costs and the half of the floor improvement costs and then make a deal.