You have very diverse subjects. This will be harder to create a market. Perhaps start with two instead of four? I can see that cars and bikes might be a good start. There will be a good market in the classic car genre and motorcycles. I say this because you will have marketing opportunities from classic car shows and the interest in that genre. Most of the interested in this market have disposable income which will help you sell. You could also include airplanes, choppers, and the space industry, widening your market well for this genre.

Animals is very competitive and crowded with artists. It will be harder to establish yourself, due to the competitive nature of this popular subject.

The castles market is highly niched with fairs and festivals for the Middle Ages being popular but with how many buyers?

Best of luck.

I don’t see why you need to stick with only one. It’s the internet, so why not market to many different audiences?

I would take “online” out of the mix, since you’re online. That is a given.

Being more general in order to include all your subject matter, is okay: semi-realism. Then you can also market with specificity by subject matter, but you don’t have to. Maybe you want to go by medium or hone down the style better. Are they oil paintings?

On your website, you can make categories for the various subjects so your users can see your work in a consistent context with each other. Your focus is to get people who are interested in semi-realistic art in the style you paint to your website, then making sure the SEO on your site have the right keywords. That way, when someone is searching out specific things like natural disasters or castles, your site pages will appear in Google.

That’s just my opinion and I hope that helps a little.

NICHE

A niche is a very targeted part of the art industry that focuses on specialisation. It is very specific, but has a lower volume of people involved; therefore giving you a smaller set of competitors and higher chances of converting sales.

Here’s an example: If you’re a watercolour artist whose forte is in painting landscapes and seascapes, then it would be easier to target an audience interested in that subject matter, rather than competing with a whole world of watercolour artists. With this, you can focus on developing your techniques and how to sell art. Focusing on this will certainly gain you more traffic in the long haul!

MARKET RESEARCH

This entails educating yourself by reading up articles that discuss how to gain exposure as a visual artist, how to identify your target market, and put these steps into action. You can experiment which works of yours are well-received, and which ones do not get much attention. Everything is a learning process, so it is good to note down all your observations and keep it for future use. Note down the people who engage with your work on social media, inquire through galleries, and send you direct messages or emails. Converse with them and understand what they like about your style, what sets your work apart, etc.

Moreover, identify what types of artworks are strong in the art market at present, and how you can incorporate your own style in this. Do not get pressured or sacrifice your style for marketability. You should always find a balance. After all, your uniqueness as an artist is what makes you, YOU. This article about selling your art as a professional can help you deal with this problem more thoroughly