Size doesn't matter here whether it is small or large as long as it is related in bitcoin, blockchain and the likes stuff. However if you will based your style of artwork by the preference of the community then maybe you should check these
10th anniversary art contest badge voting. The artworks in this thread was made by crypto-artists who attracted most of the forum users here. Maybe you'll have an idea of what type of artwork you are planning to create.
Additionally, some wants a digital copy of a digitally made artwork.
As per seeing your post history, you are trained as a traditional artist, I would suggest that you should create an oil painting that depicts the current issues or trends in cryptospace. It will gain a lot of attention if you'll focus on the Hyperrealism side of oil painting.