You might like 'Semantic Error'. It has similar elements of romance and character dynamics as Sketch. The story progresses smoothly and the visuals are appealing.
Sketch bl manhwa often features unique art styles, focusing on the emotional connection between male characters. The storylines can be diverse, from romance to adventure.
You might like 'True Beauty'. It shares some similarities with Sketch in terms of character development and the way it captures emotions. Also, the art is quite appealing.
Sketch BL manga is known for its visually appealing depictions and complex character relationships. It can delve into various genres like fantasy or slice-of-life, and the emotions expressed are often very raw and touching.
I'd recommend 'Killing Stalking'. It has a similar dark and intense atmosphere like 'Painter of the Night'.
I'd recommend 'Cherry Blossoms After Winter'. It has a similar emotional depth and engaging storyline as Jinx.
I think 'The Tutor' could be similar. It has a similar intensity in the relationship and character development.
Try 'Killing Stalking'. It has a similar intensity in the storyline and explores the darker sides of human emotions, similar to Low Tide in Twilight. However, it's quite intense, so be prepared.
I'd recommend 'Love Is an Illusion'. It has a similar level of drama and character complexity as Jinx.
There are a few like 'The Gamer' and 'Lookism' that share similarities with Sketch in terms of art style and storylines.
You could try 'Killing Stalking'. It's intense and keeps you on the edge of your seat. But be warned, it's quite dark. Another one is 'The Tutor's Secret', which has a unique plot and interesting characters.