This painting was done over an old one and in a section there's texture that's irrelevant to the final painting. It's a problem partly because there isn't similar texture elsewhere in the painting, and partly because it doesn't relate to the subject of the painting. If the texture had been horizontal it might have added to the feeling of sea, but as it is it simply looks like muck on the painting.
It's unfortunate that I only noticed it once the paint had dried, and so any attempt at fixing it will involve a fair bit of repainting. (I'd been trying out a new brand of acrylic paint, so had used an old canvas as I'd intended to simply play with the paint. As it was, I ended up with something I wanted to keep.)
I could either add more texture to the painting overall, hiding the mistake, or remove the lump and then repaint. As it's acrylic paint, I'd first try peeling or picking it off with a fingernail (you could use a knife, but I'm paranoid about slicing a hole in the canvas) or by using some sandpaper to wear it down. If it were oil paint, I'd go at it with some turps on pointed edge a cloth.
It's unfortunate that I only noticed it once the paint had dried, and so any attempt at fixing it will involve a fair bit of repainting. (I'd been trying out a new brand of acrylic paint, so had used an old canvas as I'd intended to simply play with the paint. As it was, I ended up with something I wanted to keep.)
I could either add more texture to the painting overall, hiding the mistake, or remove the lump and then repaint. As it's acrylic paint, I'd first try peeling or picking it off with a fingernail (you could use a knife, but I'm paranoid about slicing a hole in the canvas) or by using some sandpaper to wear it down. If it were oil paint, I'd go at it with some turps on pointed edge a cloth.