That's pretty damn good!

The color or tone of the knots looks a little to different from the colors / tones elsewhere in the wood... I think. Which... I think... is what is jarring a little bit for me. But the placement of the knots is perfectly convincing I think.

Can you place subtle, inset rings within the knots... somehow?

The rest of the texture is fantastic, I reckon... and the knots are not too far off.