lots and lots of practice. your work might look wonky at first, but its the only way you can learn. i also took a few virtual classes a while back and they helped a lot since I learned a few techniques that i could apply to future works. def look into that. also, you dont need fancy tools or anything. just use what you have and see what you can do. remember to have fun with it! art can be very rewarding. good luck :)
the person that has the picture out most likely has a friend in that picture and they want to question the friend in the picture cause they are probably close with the criminal.