What is normal development for children's drawing?

I have a 2.5 year old who is quite advanced verbally, loves a good chat with everyone she meets and is generally happy and healthy. My question is around the development of drawing and what that indicates for a child's development more broadly. My little one is just in love with color. She will, if really cajoled, draw a face accurately (with no help or guidence from us other than we'd love it if she would draw a face), but by and large just prefers making colourful random lines, squiggles and blocks of colour all over the page. If asked what she is drawing she either doesn't answer or points ot a line and says its a chicken or something when clearly she's just making colour. She adores colour. In clothing shops she is in ecstacy over the colours and textures and makes non stop commentary about all the clothes and what she might wear when she is a big girl. Is it normal for a 2.5 year old to prefer making coloured lines than actually conciously drawing anything? I don't want to push her to do anything she isn't ready for, but just a bit worried by the complete lack of interest in drawing anything specifically. She loves to colour in anything I draw, but won't do her own drawings. Can anyone help?