To expect 5yr old DS to be able to draw representational pictures?

[TheSeaTheSkyTheSeaTheSky]

Hi all,
I'm probably over reacting about this but it's one of a number of issues with DS1 which make me concerned - although hopefully the answer is simply that 'he's a boy'!
DS1 is a late August birthday so just gone into Yr 1 aged just 5. Many of his friends seem to be reading and writing relatively fluently, drawing clear pictures of recognisable things (police cars, guns, the usual boy stuff) and even writing captions to them. DS1 comes home telling me he can't remember what he's done at school, which to my mind suggests he's messing about and not paying attention. When we play with play dough he just makes a mess instead of actually making 'something' that represents something in the world around him. Today I asked him to draw a picture and he just did scribbles - when I asked him to draw me a house he basically couldn't do it without a lot of help and guidance. He's never been into drawing and colouring and now I'm wondering if i should be 'making' him do it as a kind of homework.
He can copy words and write quite nicely when there's a treat in it for him and his reading is OK but this thing about drawing and making things that look like something is really bothering me. Is it just a boy thing or something more worrying? And if it is just a boy thing when can I expect him to 'get it' and start paying more attention to what's going on around him?
So AIBU to expect him to be able to do this? Is this a sign of something I should be doing something about or am I just an over anxious pushy mother?

At 5 in year 1, DS could draw two things. rainbows and houses. All the houses he was drawing had exactly the same 'design', four windows, a door in the middle, a pointy roof, a chimney with smoke coming out. And once he drew a house with a rainbow on top. Bril. But that's about all he could or would draw.

Now he is in year one he has added stick people to his drawings of houses and rainbows, but they have no body. There's a head, with two arms and two legs sticking out of the head. He always comes out of school very proud of his houses. He's gonna be an architect I'm sure. Or a rainbow man.

Yes my DS does not conform to that stereotype either. He is 5 summer born and can draw very well, he will sometimes draw for an hour or so depicting a scene complete with captions none of which has anything to do with me. His skill in this area was highlighted at nursery and by his reception teacher. My DP is an Architect and my DS has always seen him sketching etc. Art is very important in my DPs family so I don't know if it's in the genes but.......he is never in the thick of the climbing action at the playground or rolling around play fighting, football he likes but he's quite cautious so the physical nature of the game discourages him from really throwing himself into a game. As others have said I think it's just down to individuality rather than there being a problem.