Good technical writing is the epitome of logic and brevity. The language of technical writing is different from the language of standard writing. Not only does technical writing include technical words, but the language in general is more formal. This does not mean that you should try to sound stuffy or sophisticated. As with any writing, you should strive for clarity and simplicity, but technical writing takes pains to be precise and this often leads to formality.
Beautiful language is secondary in technical writing.
This arises mainly from authors' attempts at brief, clear explanations. Nonetheless, look at word choices, sentence structure, etc., and try to bring beauty and dignity to your writing. The emphasis should be on your subject matter, not the author. The greatest difficulty faced by most readers of technical articles is understanding an author's mathematics. Mathematics and statistics are tools that should help explain your work, not camouflage it.