There are various method to beautify your image, the most direct one is to add some lightings and simple shapes to make it full of contents. It is very important to choose right lighting style and objects to match with. Here is a nice simple for your reference.
日本語: まだ 日本語 版の翻訳はありません。英語で見る — showing the original English article below.
Turning Your Image into a Nice Model Image
日本語
Photoshop Lady のおすすめ
専門家のガイド、レビュー、ヒントを受信箱にお届けします。スパムなし、いつでも解除可能。