Another approach is to visit tattoo studios in your area and look at the designs and photo displays on the wall or their album to search for inspiration, but keep in mind, don't limit your imagination to what someone else already has, be creative.
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However when you post a job for a custom tattoo design online you will frequently have 5 or more artists all bidding to do the work for you. Having more artists means you are more likely to find a tattoo artists that better fits with the style of tattoo design that you are looking for. Further more as we all know when people compete for your business you get better quality at a lower price.