If you think you have the talent and enthusiasm to be a pro artist, you should continue. However, remember that talent alone will not take you anywhere unless you can put discipline into your routine and promise to improvise for your shortcomings.
Modern decorative art painting is more about observation and perseverance than anything else. However, some educational or technical qualifications also help. You can also visit www.londontradeart.co.uk/storeroom to purchase modern art prints online.
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Although you can register for several courses if you want, the best form of learning is independent education. Research as much as possible, observe the paintings of artists from all eras and try to experiment with different styles.
When you work on modern wall paintings, you will produce bad works more often than good works. That is an inseparable part of an artist's life. Don't let your failure curb your enthusiasm; continue to improvise and produce works until you come up with perfect art.
Warming up is also important. Your first few brush strokes might not give good results. Give yourself time to step forward and after an hour or more you will feel confident when you get into the right mood. Contemporary canvas artwork also requires a professional to be careful with its materials.
Because you aim to be a professional artist (and not just an amateur), you shouldn't use bad material! Even if you have to invest some extra money, make sure that your paint, canvas and color brushes are professional quality.