So You can see how important a site like this is.
You put a profile on the forum, end you get help full tips en nice reactions on your work. Comments so you can improved your skills. Here I show you the results. A improved Camel
The only thing I can really suggest is perhaps some shadows cast by the wings on the struts in between the wings and on the undercarriage framework/struts. Might help to give those areas some depth?