I'm afraid it's going to be a world of pain for you when it comes to art education in the UK.
I have a very traditional, old school style - which did not go down well with college tutors or many art teachers - but did make me very employable once I escaped.
However there are lots of options these days to learn properly - youtube, online courses, weekend courses etc. The stuckists are worth investigating as well. Nothing wrong with abstract art, but I am very old fashioned and think you cannot do abstract art well without very solid traditional drawing skills underpinning it... Picasso was a master draftsman at a very young age.
At 4, the most important thing is to be having fun and enjoying it, as well as being exposed to different art and artists - galleries, museums etc. Also different mediums - paint, pencils, clay, chalks etc.
With my own DD (who I steered away from art as anything more than a hobby), I saw she was getting frustrated quite young and so I showed her how to do shading to make things look three dimensional, and also teaching her how to see.
By that, things like understanding negative space and proportion and seeing how colour works and that you might think that that apple is red in your mind, but when you look properly there is blue in the reflections, and greener bits etc.
There's lots of info online about how children's art progresses which is fascinating and might help you see when to step in and when to just wait and watch. Things like around 3-4, people have heads, arms, eyelashes, nostrils, fingers.... but no body!