I think You’re overpriced
There are bigger properties
some not terraced
bigger gardens, mature planting etc
for less or similar money
New properties have a lower £/m2 asking price than yours and usually they are more expensive
If you put TN39 and 3 bed houses on rightmove search
you’ll see your house sits, price wise, amongst larger semi detached properties.
I think that’s mainly why it’s not getting much interest
I do also agree the images aren’t helping
maybe add some colour
get rid of the box at the front door
and the play house in the garden image
add some plants at the rear and front