There are actually a few correct ways to get on the 8 from here. Of course, each shot comes with its own problems so I'd actually have to be standing over the shot to make a decision here but these are the shots I'd consider:
1. Carom the 4 off the 10. This SHOULD straighten out the path of the cue-ball and allow me to miss the cluster completely. It's the ideal path to take but if there's any chance I'll clip that 15-ball, I'll have to consider something else. On big pockets, I'm going to strongly consider this approach.
2. Pocket the 4 clean and run into the cluster firm. This shot looks more appealing in the diagram than the picture. If I can make sure I run into the 14-ball first with speed, I should get a favorable carom off the 15 to bring me closer to the 8. I may even use a little jack-up draw to see if I can delay the draw action a little. On new cloth where I can anticipate a little extra roll (which is all I'll really need), I will strongly consider this approach.
3. The jump-shot. You can actually jump the cue-ball off the 4. Doing this requires a firm stroke and you'll miss the cluster completely. The only problem is, your cue-ball will be racing a bit so you might consider trying to jump with a little draw and see if you can slow down the cueball and/or run into either the 12 or 13. On slow cloth where the cueball is going to lose momentum quickly, I'll strongly consider this approach.