It looks great ! As the house is lighter and darker greys , I'd add a white gloss painted 'rail' around the top -- hard to tell appropriate sizes from the photos , but probably pine 150-200mm wide and 60mm tall . Easiest would be to simply nail it to the posts and top rails , but if you added some spacers ( cut some 100 x 50 pine into 100mm lengths , then stain them the same dark grey fence colour , nail to the posts and probably every 'halfway' too , it would really 'lift' it more ? IMO that would really tie it all in with the house , and look classy , for maybe $2k tops .

Go to Houzz PHOTOS. Enter "Exteriorscapes Llc" in the search box. There is a wood fence with pickets like yours that has been painted in bright colors as one option...

https://youtu.be/JjVdV609SVA

I'll say it straight out -- I personally don't think the style of fence matches the style of house . But not painting it makes it even more obvious . Maybe you need a new friend haha . Me -- I'd render the wall , and paint in an English Cream , AND do the 3 gables and the boards above the garage door and any other trim in the English Cream too , to tie it all in . IF the bricks were still available , I would have gone down that route , with the rendered fence pillars ( and gables and trim ) in an English Cream , or possibly the pillars in the same white as the house bits , but generally I'd try and go a bit closer to the brick colour than 'just' a white . It's workable , and almost anything would be better than leaving the blocks as they are IMO .