Hi your tennis is ok but its hard to assess cause i dont see important factors e.g. depth of your shots, serve accuracy etc. Technique seems to be ok but i would prefer to work on foot-working. Look at your backhand shot after serve. You are not ready to step back, prepare backhand and shot cause your foot are not ready. So i recommend work on this. I dont criticize however i try to help. If you would like to get some exercises on footwork for backhand, just reply. anyway, where you have so beatiful tennis location?