Speaking as someone who is currently spending a LOT of time on RightMove...
The lack of floorplan is annoying. It's the first thing I look at. From the pictures, it looks quite spacious, but the lack of floorplan suggests either that the layout is very strange and something the sellers want to hide, or a lazy estate agent.
No complete kitchen view. I want to see it from all angles - all sides. Plus, it's a bit of a hodge-podge. Black fridge, with white cupboards/counters, and the none-matching floor.
Parking - it needs to be really clear from the photos alone what the situation is. I assume that lean-to garage on the right is yours. Everything needs to be really clear from the pictures alone. They are what attract people in. If the pictures aren't right, no one will even get as far as reading the particulars. For 600K I'd want at least a private driveway.
Street appeal - it does look like a lovely house, but some pots out the front, or some hanging baskets would really do it some favours. The picture of the front is the first picture that comes up. It needs to really grab people... I got my house because the picture of the front was awful! The estate agent seemed to think that crouching on the driveway, with the sun behind the house - making it look really, really dark, was the way to go. And acres of driveway dominates the picture.
It does seem very expensive though... I've no idea what the housing market on the Manchester outskirts is like generally - but I thought up North was supposed to be cheap! I'm in a midlands town, with great commuter links, and a house like that down here would be around the £450-500k mark. I'd personally expect a lot more "house and land" up North for well over half a mill.