Remove Background The results came out very bad

[akhanan32322677fmz1]

I have tried using online services that cost money and the results are much better. I will have a way to customize it. Do the parameters give better results?

[Bojan Živković]

I got much better starting point using Select > Color Range. Later I did some small adjustments in Select and Mask workspace using the Brush and Refine Edge tools.