Hi OP, firstly the living room. The carpet looks mucky, can you get or borrow a large rug that will cover right across both couches? You have two couches and the one by the tv makes it look really cramped. Can you have that one removed and replaced with a single seater that compliments the other couch? It can be facing the tv and make the room more spacious.
Dining room. Store away the toys and the hoover! Thin the books on the shelf and display them attractively (they are higgledy piggeldy at the mo). Move the table to the middle and dress it attractively. A vase of summer blooms would be nice too.
Kitchen. Looks ok but don't personally like pink walls. Make sure it is pristine clean for viewings.
Your bedroom. Headboard looks stained. Cover it with fabric and use a staple gun to fix at the back (I've done this, its easy). I would advise that you invest in matching duvet set and curtains to tie everything together. A nice vase of coordinating flowers on the dressing table.
Kids room. Ok, although very blue.
Bathroom. You have two pics. Number 12 is better, less cluttered.
The outside front of the house looks good and clean. There is no pic of the hall. Make sure that is clear of clutter completely. The back garden: the garden table could have chairs around it and be dressed with jug and glasses.
If you can make these changes and get new better photos taken you may get more interest. When doing viewings, talk up all the positives of the area (convenient for schools, public transport, shops, libraries, good parking, other amenities).
Hope this helps, OP. Good luck.