For just over £30m, Nicolas Jackson has proven to be quite a good signing for Chelsea. Nicolas Jackson joined Chelsea from Villarreal last summer and managed to score 17 goals in his debut season. However, there are still areas of his game that need improvement. For example, Jackson’s finishing is often criticised. The striker, though, has been speaking about another department that he could perhaps work on. READ MORE: Alan Smith shares what Nicolas Jackson is really good at after watching him in Chelsea’s win vs BournemouthNicolas Jackson honest about headingOne of the two goals Jackson has s…