Yes. you are right, canopy framing still needs some correction and front engine cowlings shape is also not entirely correct.
For the rest this pencil darwing give a very nice impression of the famous Fokker G-1 and I really wish you the best with your oil-paint version! Please, note that the last insights on Dutch colour schemes is that the 'light sand' colour (as also used for the Fokker D-XXI!) is not correct. In reality it was 'light-beige' rather than light-brown and -interesting enough- a grey-type paint!
In fact the colour scheme of the G-1 model and the D-XXI replica as exhibited in the Militaire Luchtmachtmuseum (MLM) at Soesterberg will need correction on this point!