Purpose: The cartoon is illustrating that life isn't better when Spain is free. It depicts poverty and economic downturn, which is a reflection of the Great Depression. The cartoon also illustrates the wide gap between the rich and the poor.
Value: The cartoon is valuable because it illustrates that some people were against the republic and they didn't believe that the republic was going to be able to fix everything. There was anti-republic sentiments within Spain and people may be thinking that life would be better under a monarchy or even under a dictatorship.
Limitations: Obviously one huge limitation is that I don't know when or where it was published.