Here are a couple of sites that will be of help. After you have done some writing, please post your essay and a teacher will be happy to give you suggestions or make corrections if needed.
http://www.rscc.cc.tn.us/owl&writingcenter/OWL/Describe.html
http://www.eslbee.com/compcont.htm
Descriptive essay with the use of degrees of comparison on the topic - At the Airport
2 answers
Descriptive writing
http://grammar.ccc.commnet.edu/grammar/composition/narrative.htm
Degrees of comparison
examples:
good, better, best
bad, worse, worst
pretty, prettier, prettiest
beautiful, more beautiful, most beautiful
http://grammar.ccc.commnet.edu/grammar/adjectives.htm
Scroll down to Degrees of Comparison
http://grammar.ccc.commnet.edu/grammar/composition/narrative.htm
Degrees of comparison
examples:
good, better, best
bad, worse, worst
pretty, prettier, prettiest
beautiful, more beautiful, most beautiful
http://grammar.ccc.commnet.edu/grammar/adjectives.htm
Scroll down to Degrees of Comparison