As mentioned by others: It is impossible to definitely judge the situation from just the photo, and that's all we have. As far as I see, there is no protection between the roped climbers here. So my answer is under the following assumption:
The party is roped up with lots of rope between climbers without any protection in a steep slope of mixed snow and rock.
This is never a good mode of ascent as it highly increases the risk. Lets define a "death rate" as probability of an event times amount of casualties resulting from that event. For simplicity every climber has a 1% chance of falling. When soloing the total risk of the 4 climber party is thus 4 climbers * 1% fall chance * 1 death = 4% death rate. If they are roped up, the risk is 4 climbers * 1% fall chance * 4 deaths = 16% death rate. It increased 4 times (in general by the amount of climbers in the party).
Ascending roped without protection is done with a taut rope very close to each other. Even in that configuration it is hard to arrest a fall, the idea is more to prohibit a fall when the second stumbles. On a long rope with (inevitable) slack it is impossible. The only slim hope is, that while falling down the rope entangles itself in a rock... Every year in the mountaineering accident statistics of my country (tiny Switzerland) there is a few casualties from so called "Mitreissunfälle" (literally carry along accident) - so this is not theory, it happens.
There are several options that all have their place depending on the climbers and conditions: Short-rope, running belay (long rope with protection in between), fixed belays or soloing.
Of course there is the case of crevasse terrain with intermediate steep section where one is inclined to keep going on long rope without protection to save time. This is however just a pretext and should not be done unless you are under serious time constraint and every one in the party understands the risk. Rather invest some minutes to unrope or put in some (few) protections on a running belay than pulling/being pulled to death with your friends.