Are these breakers suitable for a GE panel?
TLDR: They're all wrong.  Swap with a GE or classified breaker (e.g. Eaton CL not BR). 

Allowable breakers

You can use several breakers inside a panel. 


Breaker types which are listed on the panel's labeling, these will be made by the same manufacturer and the same type, and UL-listed. 
Breaker types which are contemporary to your panel's labeling, but again are still the same manufacturer, and they state they will work in your panel, or substitute for breakers which are labeled for use in your panel.  Also UL-listed.  
Breakers which are made by a third party, who sends them to Underwriter's Laboratories to have them UL-listed for the competitor panel.  UL calls this a "UL-Classified" breaker, and they run the same set of tests they run on factory breakers.  If you research the manufacturer of the breaker and their classified breaker lines, they should show a cross-reference chart stating which factory breakers their Classified breakers can substitute for.  


UL-Classified breakers

Classified is UL's way of saying these are not OEM breakers and do not have the benefit of the OE's expertise and trade-secret knowledge, but they do pass safety testing. 

Keep in mind that a manufacturer's Classified breakers are different breakers than the OEM breakers they make for their own panels.  For instance, Siemens QD breakers are classified for Square D QO panels, and must not be used in any Siemens panel of any kind. 

Similarly, you will see that Eaton's CL line of breakers is not UL-classified for use in Eaton BR panels -- even though the breakers may look outwardly the same.  

This should not be confused with cross-listing.  For instance,  Challenger panels have breakers known to be defective (but panels are fine).  People seeking to replace those breakers find their panel labeling requires type C breakers. They are pleased to discover that Eaton's BR line is cross-listed as type BR and type C. 

Your breakers

On your panel, we can strike out the Square D breakers immediately.  Square D is absolutely opposed to "Classified" breakers.  They refuse to make classified breakers for competitor panels, and they object to the use of Classified breakers in their panels (not that they have anything to say about it).   So the Square D "HOMeline" breakers are out-of-place because Square D says so: You are using this breaker in contradiction to its labeling and instructions, which violates NEC 110.3(B). 

It also violates NEC 110.2, which requires all equipment must be approved. 

Siemens does make classified breakers.  They make the QD type for Square D "QO" panels, and the MSQ type also for Square D "QO" panels.  Now, Siemens' website just burned down so Google is useless (every page is 404).  But from Google's view of their pages, it's clear they don't make UL-classified breakers for GE panels.  Even if they did, their MP-T type is not that; being made exclusively for Murray lineage panels.  As such, 110.3(B) and 110.2 apply, same as above. 

The proper GE breakers are perfectly reasonably priced.  If they weren't (QO isn't), then you could consider classified breakers made for that panel, such as Eaton CL.  Do not use Eaton BR; as mentioned earlier, a manufacturer's classified lines are incompatible with their own panels, unless they are also classified for their own panels (The fact Eaton didn't classify the CL line for BR probably means they can't.)