1) Not abstract or ideal 2) Realistic 3) Representational 4) Representing what is real 1) Representational 
• (a.) Closely resembling nature; realistic. • (a.) Belonging to the doctrines of naturalism. • (a.) Belonging to the doctrines of naturalism. • (a.) Closely resembling nature; realistic.
Nat`u·ral·is'tic adjective 1. Belonging to the doctrines of naturalism. 2. Closely resembling nature; realistic. ' Naturalistic bit of pantomime.' W. D. Howells. 
Descriptive of an artwork that closely resembles forms in the natural world. Synonymous with representational.
[adj] - representing what is real
artwork that looks like the subject it is trying to represent.
realistic adjective representing what is real; not abstract or ideal; `realistic portraiture`; `a realistic novel`; `in naturalistic colors`; `the school of naturalistic writers`
imitating nature or the usual natural surroundings. · pertaining to naturalists or natural history. · pertaining to naturalism, esp. in literature and art.