Do not make a colour-dependent logo. Always try the design out in black and white before adding colours to it. This way you prove that the logo without colours is communicating the core business concept the same way as it is with colours.
The logo maker proves its professionalism with vector graphics because it adds flexibility and scalability in the design which the rasterized image cannot bring. It is easy to reproduce and print, from post stamp to bill-board size. There is no issue of pixel burst in the scalable vector design; thus,this way you keep up the logo quality in all sizes.
Take inspirations but do not copy. Make sure your logo has copyrights so that there are no infringement issues for your company. Make your logo memorable through originality and individuality rather copying and distracting target audience attention towards the original logo.
Be a trend-setter, instead of being a trend-follower. Create inspirational, creative, unique designs for long-lasting audience remembrance, identification and recognition of logo with the business. The trendy logos have short life.
Choose a colour combination which supports business theme and concept. Choose colours according to the preferences and likes of the target audience. Make it appealing and attractive.